Rectangle Jumping Mat for 9x16 or 9x17 Frame with 100 V-Rings Mat size is 7x14 Spring Configuration: Long Side: 33 Short Side: 17 Spring Size: 8.5" Possible Trampoline Brand: JumpKing Sidlinger Texas Trampoline We use grade A polypropylene constructed of high quality materials to ensure your kids will be bouncing safely for a long time. (mats do not include springs) How to Measure a Trampoline Step 1: Measure the diameter of your trampolines steel frame length and width Step 2: Count the number of v-rings on your trampoline mat. Long and short side, corner springs? Step 3: Measure the length of your springs (note: to measure correctly, remove the spring from your trampoline and measure the length from hook-end to hook-end).