This Machrus Upper Bounce Jumping Mat is specially designed to fit 8 FT. Trampoline Frames of all brands and models, with 42 VRings using 5.5in Springs. Machrus,s Upper Bounce Trampoline Jumping Mat features ultradurability through its premium PP Mesh Material. Furthermore, our Jumping Mat also provides extra security with its 8row stitching thus guaranteeing the mat from tearing. Machrus's Upper Bounce HighQuality Jumping Mat is guaranteed to be UV and waterresistant, offering you a safe longlasting fun investment. The thick replacement trampoline mat ensures absolute safety for your children. The Machrus Upper Bounce trampoline jumping mat provides tremendous jumping momentum and bursting strength for a controlled and responsive jumping experience. Let's go out and play.