DOYUEE Replacement Trampoline Mats Excellent features: ?The trampoline mat surface is made of high-strength UV resistant PP material ?The triangular ring adopts color galvanized rust prevention ?Using 10 sewing threads to prolong the service life of the jumping mat ?Excellent workmanship for more accurate dimensions and optimal bounce effect ?Colored webbing make the trampoline more advanced and provide edge warnings How to choose a suitable Trampoline replacement mat 1. Measure the diameter (outer diameter) of the trampoline steel frame 2. Number of springs or triangular rings 3. Measure the length of the spring (remove the spring from the trampoline and measure, the spring is normal and not deformed) Note: The diameter of the trampoline mat is smaller than the diameter of the steel frame The Sepcifications of Replacement Trampoline Mat for 15FT Trampoline As Below 1?Trampoline Mats Fits 15FT Frame,with 96 V-Rings, Fits 5.3-5.7” Springs,Replacement Trampoline Mat Diameter 13.56FT(162.8 Inch) 2?Trampoline Mats Fits 15FT Frame,with 96 V-Rings, Fits 6.5” Springs,Replacement Trampoline Mat Diameter 13.36FT(160.48 Inch) 3?Trampoline Mats Fits 15FT Frame,with 96 V-Rings, Fits 7.0” Springs,Replacement Trampoline Mat Diameter 13.26FT(159.3 Inch) 4?Trampoline Mats Fits 15FT Frame,with 108 V-Rings, Fits 6.5-7.0” Springs,Replacement Trampoline Mat Diameter 13.3FT(159.8 Inch) 5?Trampoline Mats Fits 15FT Frame,with 108 V-Rings, Fits 7.5-8.5” Springs,Replacement Trampoline Mat Diameter 13.05FT(156.7 Inch)