Even roofs ultra-light discs have the helpful chamfer on the outer edge. The newly developed friction ring with larger apertures weighs little, but is gentle on the lining and quiet due to the carefully considered hole size. The particularly slim webs, which are connected by the connecting web to form an extremely stable triangle, also contribute to the weight reduction.

All roof UL discs are made of high-quality Japanese stainless steel, are laser-cut, hardened and ground to a flatness of +/- 0.01 mm.