Convertibles are compatible with both electronic and soft tip machines and bristle boards. Just change the point. The Precision Grip™ Convertibles allow shooters the best of both worlds while retaining the same feel and control. We offer you two darts in one. The Precision Grip™ Convertibles 90% tungsten dart line is available in smooth, coarse and Edge Grip™ knurl. Convertible darts are weighed as soft tips.