This exhaust clamp looks just like all the other common exhaust clamps.
However, with this special sealing, you have the advantage that the rubber is heat resistant and therefore does not melt even with heavily tuned mopeds / motorcycles.

Ø inside: 26.5 / 30 mm. Extra slightly smaller to ensure a proper seal.

The seal should not become brittle or run. However, you must ensure that the clamp is not overly tightened. Otherwise, the rubber will be compressed too tightly and tear.