This Machrus Upper Bounce Jumping Mat is specially designed to fit 8 FT. Trampoline Frames of all brands and models, with 40 V-Rings using 5.5" Springs. Machrus's Upper Bounce Trampoline Jumping Mat features ultra-durability through its premium PP Mesh Material. Furthermore, our Jumping Mat also provides extra security with its 8-row stitching thus guaranteeing the mat from tearing. Machrus's Upper Bounce High-Quality Jumping Mat is guaranteed to be UV and water-resistant, offering you a safe long-lasting 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.