Barley used hence sale Nice quality Premium Tungsten Currently £32 at Argos These super-thin darts offer perfect power-to-weight ratio for a smooth, powerful throw. They include the Prism Force shaft technology for the ultimate in performance and. Dart barrel dimensions - 5.1cm (L) x 0.66cm (D). These super-thin darts offer perfect power-to-weight ratio for a smooth, powerful throw.