Upper Bounce Jumping Surface for 12' Trampoline with 72 V-Rings for 5.5" Springs Mat only Available configurations: 12' with 60 V-rings, 12' with 72 V-rings, 12' with 80 V-rings, and 12' with 84 V-rings Premium polypropylene mesh material for ultra-durability 8-row stitching provides extra security and helps prevent tearing UV and water resistant