These trampoline springs are used by Leisure Kingdom and Sky Bouncer trampolines, their part for this spring is 165-SPRG, you may find that other companies use this spring also, Spring quantity: Count how many spring holes in the frame for more accuracy, (Then count how many springs you have, in good condition, recoiled and with lots of tension, You may be missing springs or want more tension), Spring length: Take a spring off the trampoline and measure it; including the hooks, to determine the correct length, (The spring coils must be fully recoiled to obtain the proper length, ), SKU: TLPAS0919