„What size is the ring?”
The tournament tennis ring has an inner diameter of 10.5cm and an outer diameter of 17cm.
„What material is the ring made from? What advantage does it offer over microcellular rubber?”
The ring is made from microcellular rubber. This means that the manufacturing process can be more precise, i.e. the size and weight comply exactly with the guidelines set by the DTB (German tennis association) and for use in official competitions.