• speedy installment
  • fully customizable

Rethinking Marker Balls
out of Austria

Discover the future of aerial safety. Designed for efficiency and sustainability, our marker balls significantly reduce assembly time and environmental impact, ensuring superior visibility and safety for high-voltage power lines and other aerial hazards.

Unmatched Efficiency in Assembly
Experience a 70% reduction in assembly time compared to competitors with our unique, pre-assembled half-shells.
Wide Application and Versatility
Our aerial marker balls offer versatility beyond high-voltage power lines!
Sustainable Design for a Better Tomorrow
Embrace environmental responsibility with our aerial marker balls made predominantly from recycled materials.
Kugel auf Stromleitung-Singalkugel Sphera

Features breakdown

time is money

Rapid Assembly

Discover the benefits
3 minutes and 1 person assembly

Our aerial marker balls are uniquely engineered for a swift and easy installation process. With pre-assembled half-shells and a quick-release fastening mechanism, they reduce assembly time by 70% compared to competitors, saving significant costs and reducing helicopter usage.

Versatile Applications

More than Powerlines

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Designed for more...

than just high-voltage power lines, our marker balls are perfect for a variety of settings, including mountainous supply lines, lift support lines, and navigation pylons. This adaptability makes them an essential safety tool for a wide range of aerial marking needs.

diverse requirements

Customization and Flexibility

View our options
Size, color, quantity: We got you

Catering to diverse requirements, our marker balls come in two sizes (300mm and 600mm) and can be ordered in standard colors or custom shades for bulk orders. Their design accommodates various cable thicknesses, ensuring suitability for different applications.

reuse and recycle

Sustainable and Eco-Friendly

Embracing environmental

our marker balls are predominantly made from recycled materials, including fully recyclable aluminum jaws. We're committed to sustainable practices, from production to our innovative 'Back-to-the-Roots' recycling program.

What makes us special?

Why choose Sphera

Unlock the potential for significant savings with Sphera. Designed to reach maximum cost-effectiveness, the Sphera marker helps you achieve
financial and time savings through our innovative solution.

Other Markers

less flexibility and longer assembly
  • Less flexibility
  • More complex installation
  • Longer airtime
= more costs



average savings
in airtime compared to regular marker balls
save from 30 to 70% in installment time
  • Speedy installment with one man only
  • Different colours possible
  • Environmentally friendly
  • Variable cable strenghts and types
  • No loose parts
  • Increased safety due to simple assembly
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A lot more than powerlines

Sphera Markers can be use on ropeways, around airports and bird sanctuaries and last but not least of course on powerlines to add visibility and increase safety.

100% clean energy!
We are sustainable

At Sphera, we integrate eco-conscious practices into every aspect of our aerial marker balls, ensuring our products not only meet the highest safety standards but also contribute to a greener future.

Made from recycled materials, fully recyclable, supporting environmental conservation

Recycling Program

Back-to-the-Roots' initiative for sustainable reuse of marker balls

Green Production

Utilizing renewable energy and heat recovery for reduced carbon footprint

Lower Emissions

Efficient design cuts helicopter usage, minimizing environmental impact.


See what our clients are saying

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Founder @ Company
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material excellence

Built for durability

Sphera aerial marker balls are crafted from high-quality, solid-colored ASA material. This choice ensures robustness, longevity, and resistance to harsh weather conditions. The main body, comprising 97% of the marker ball, is made largely from recycled ASA, reinforcing our commitment to sustainability.

More on sustainability

News & Trade Fairs

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Frequently asked

What makes Sphera different?

Sphera stands out for its innovative, eco-friendly aerial marker balls that offer unparalleled assembly efficiency, customizable options, and sustainable practices, setting new standards in aerial safety and environmental responsibility.

What are the balls on power lines for?

Aerial marker balls are used to enhance the visibility of high-voltage power lines and other aerial hazards to aircraft and other objects, reducing the risk of collisions.

What are marker balls made of?

Our marker balls are made mainly from recycled materials, such as solid-colored ASA plastic with UV stabilization for longevity and aluminum for the holding jaws, ensuring they are fully recyclable and environmentally friendly.

What are the balls on power lines called?

They are known by various terms including aerial marker ball, visibility marker balls, spheres on power lines, visibility markers, warning ball, and warning sphere.


Depending on the customer‘s needs, we deliver the marker ball halves already pre-assembled or individually. You can then store them or hang them up immediately. We remain flexible for you and in this way, you can have your order quantity delivered cost-effectively as a mix.


The marker ball can be ordered in both sizes in the individual programme. Depending on your requirements, you can compile individual packages with varying quantities for different
applications. Our recycled panels are also used in the individual programme. As with the standard variants, these are already coloured. This means that small quantities can also be produced in an environmentally friendly manner, while retaining UV resistance.

  • speedy installment
  • fully customizable

Save Time & Money
with Sphera

Contact now
Certified quality made in Austria.
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