This Machrus Upper Bounce Jumping Mat is specially designed to fit 36 IN Trampoline Frames of all brands and models, with 30 3.5inch Springs and 15 S-Shaped hooks. Machrus 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 assuring the mat from tearing. Machrus Upper Bounce High-Quality Jumping Mat is 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. This mat does not work with V-rings, The springs attach to the mat with S-shaped Hooks. (These hooks are not included.) Let's go out and play.1 year limited warranty