Skywalker Trampolines 154in x 154in CK7022 Mat for 15ft x 15ft Square Trampoline use with 96 Springs, 88 V-Rings and 1 D-Ring in the corners which takes 2 springs on each, your net system should have 4 arch poles. Compatible with the following Skywalker Trampolines, trampoline mat, models: SWTCS015