The Hollow belts and tube belting are available their outside diameter range including 3/16, 1/4, 5/16, 3/8, 1/2". They have durometers which are 83 A and 85 A.
The maximum belt stretch with standard barbs is 7%. Every 100 ft. roll has 25 aluminum barbs.
When using the hollow belts, eye protection should always be worn. The hollow belts should not be over stretch. The belts can spring apart and act like a whip if they detach. It causes barbs to injure the eyes.