Rectangular, oval, rectangular rounded edges ribbed black plastic insert plugs, end caps with smooth sliding surface. Manufactured in Germany. 
Brilliant product. Far superior to felt stickers
Leg cups arrived in good time and were just what I was looking for - thanks!
A very good product. Delivery was very quick. Satisfied customer
These items are of good quality and were fit for purpose. My only negative is that I thought them expensive for what they are.
A really good size and super easy to fit