The World Darts Federation officially recognizes the Viper Black Obsidian, Viper Razorback, and Viper Slash sisal dartboards as top-quality dartboards, according to their strict testing standards. Through the WDF's rigorous tests, our Obsidian, Razorback, and Slash dartboards proved to meet and exceed quality expectations set by this industry leader in darts. The WDF's accreditation enables dart players worldwide to play confidently on Viper dartboards.