The SBT Attachment Strap is made of Heavy Weight Polypropylene Webbing rated at a breaking strength of 675 to 1800 lbs with a melting point of 330 degrees fahrenheit. It is used as part of the SBT system to hold the independent arms with the ability to hold up to six (6) arms or simply one. At SBT we use a basic setup of two (2) arms for all basic movements. The system is built with 2 D-Rings on each end for easy attachement via a 600 lb Caribiner. The attachment strap also serves as the “Over the Door” strap for covenient set up at home.