The patent pending design uses Sling Shot material that stretches, allowing a greater range of motion compared to the standard attachments. The stretch of the material creates a banded feeling creating a greater “pump” as you can get deeper in the movements for greater muscle contraction. Each attachment forces greater core and muscle stabilization. It allows for you to get more from less and you don’t need to use a ton of weight to get the most out of the movement and the attachment. The Tricep Extension Shake Strap is the perfect length for tricep movements and give you a nice break for your elbow joint.