The Viper Razorback is a 100% staple-free spider dartboard constructed from self-healing sisal bristle fibers compressed together, providing unsurpassed durability. Utilizing razor thin galvanized wires, the surface area is greatly increased which helps prevent bounce-outs. The Viper Razorback is an official tournament size board, measuring 18" in diameter and 1.5" D. A movable number ring further extends the dartboard's life. This dartboard accommodates both steel tip and soft tip darts and includes mounting hardware.