The Quick Flex Bar is designed to attach to the Tumbl Trak,™ Inground Tumbl Trak, Xtreme Tumbl Trak, Preschool Tumbl Trak and Porta Trak, and is a great alternative to the Frame Bar. Its foam covered strap is soft and very friendly for improper landings. The bracket has been completely re-designed for tightened attachment to the Tumbl Trak.