one80 j21 01 darts 21g blackONE80 DART BLACK J21 With our new One80 Black J21 series, One80 has pushed back production boundaries using a combination of convex curves, precision lineal cuts and radial grooving to produce our most advanced aerodynamic series to date. The smooth transitions between groove sections maximizes comfort and grip security, while the new electro titanium two colour coating gives the ONE80 Black J21 series a unique stunning visual look. The ONE80 Proplast