Upper Bounce 40" Mini Trampoline Replacement Jumping Mat fits for 40 Inch Round Mini Trampoline Frames using 34 springs (springs not included) Trampoline Frame size:Made for a 40" Round Trampoline (for your trampoline size: measure frame from one outside edge vertically and horizontally to the other outside edge, make sure to measure it both ways to confirm your size) Material:Heavy Duty Premium Polypropylene Mesh Material has 8 row stitching which provides extra security that prevents the mat from tearing and guaranteed to enjoy for many years! Mat fits for 40" trampolines using 34 springs (Springs not included) This mat does not work with V-rings, The springs attach to the mat with S shaped Hooks. (These hooks are not included) You will need to insert the S-shaped metal hook into a set of holes on the trampoline, you will then need to attach a set of 2 springs per metal hook. Mat size including V-loops: 33.10" Mat size excluding V-loops: 31.50"