This trampoline frame pad is for use on a 10 ft. by 15 ft. rectangular trampoline with 8 poles and 7 in. springs. This frame pad consists of 6.5 oz. ARIA material. Determine the size of your trampoline by measuring the diameter of the trampoline frame. Take the measurement from the outside edge of one toprail to the outside edge of the exact opposite toprail. Be sure to take two measurements in different locations to confirm your size. Please remember when measuring your springs to measure an unstretched or undamaged spring. Measure the complete spring from hook end to hook end.