The Bottelsen Gorilla Grip™ dart line is made of 90% tungsten and features Bottelsen’s Gorilla Grip™ knurling. Unsurpassed in the industry, the Gorilla Grip™ knurl provides the most aggressive knurl available for greater control and higher scoring potential. Available in 18 gram weight. Darts are packaged in a deluxe metal, Croco’Case.