Tumbl Trak Orbiter Back Handspring Trainer The Orbiter is Tumbl Trak's new innovative multi-functional piece of equipment It is a combination of the 42" long Air Barrel and a pair of firm foam rings With Tumbl Trak's Booster Blocks, the Orbiter is "one size fits all" It can be used for back handsprings, front handsprings, round offs, back tucks and much more The foam ring halves can be removed and used for preschool or recreation programs and cartwheel or conditioning stations