I am going to assume you are referring to the straps used to keep gymnasts from falling off the bars while learning difficult skills. All of the straps I've seen are made of nylon webbing that is the same type used in rock climbing and mountaineering. It is extremely strong and able to hold up the extreme forces and heavy use in gymnastics. The straps are made in a variety of sizes to accommodate gymnasts of different ages and sizes.
mouth guards are made of rubber
The ancient Greeks invented gymnastics
He has made gymnastics his whole life.
The olympics!
1780
wood
1972 by cellin stone
Usually rubber
The ancient Greeks
They were originally made of hay.
Bob newton
teenagers