Altadore Gymnastics has 3 safety strap bars. What a luxury!
Only 2 have PVC pipe.

larger version – flickr
Actually, this is my least favourite system. Using the pipe means the kids do not need to flip their wrists in handstand.
My favourite is this system:
… 2 inch (5cm) wide straps with long sport socks (from the lost & found) wrapped around the bar. I want to simulate the feel of the actual wooden rail for the girls.

Mountain Shadows Gymnastics
However, the PVC pipe is easier for beginners. It would be ideal to have both systems on each straps rail in your gym.
related posts:
video – gymnastics safety bar straps new video – Working the Strap Bar
I’ve had a couple of emails lately on how long the straps should be. I find most kids use straps between 26-35cm long, sewn in a loop from 55-75cm length of nylon webbing. (That’s 10-14″ long, from a length of material 21-30″ long.)
Or … you could simply buy them from 10-0. Note that those are the narrower 1″ version.
