Cactus Ropes CoreTX Thrilla Rope that is a 100% natual nylon 4-strand heel rope with a neon orange nylon core center. Cactus Ropes 36' 4-Strand Core Rope Thrilla Heel Rope "The Thrilla Competition, The Thrilla Winning" Lots of Tip Weight Smooth quick feel Extremely Durable Neon Orange 100% natural white nylon CORETX by Cactus Ropes THRILLHL