JUMPING MAT ONLY - SPRINGS NOT INCLUDED!. Mat Size (Across): 150 in. V-Ring Quantity: 72. Compatible Spring Size (Springs Not Included): 5.5 in. SPRINGS NOT INCLUDED. SPRINGS ARE NOT INCLUDED WITH THIS MAT. You must have the following specifications to buy this product: 1. Your current trampoline frame size. Get this information by measuring the outside steel "Circle" that makes up your trampoline frame. Measure all the way across from one end to the other, on the outside of the steel frame. 2. Your current spring count. Count how many springs your trampoline is suppose to have right now. 3. Your spring size. Measure at least 2 or 3 of your current springs, off of the trampoline and as unstretched as possible, and measure the entire length including the hooks at the end. It also helps if you know the brand name of your trampoline. This particular mat is known to be compatible with the following brands, and may possibly be compatible with other brands as well: Bounce Pro