One Ball Unisex Diamond Tuning StOne Ball 40-11-15-11-29 Made from polypropylene and co-polyester

Made from polypropylene and co-polyester (BPA free)

Built-in bleed valve allows for easy adjustments

flip-top chug spout

Lower-Body Lining: 78 G/M² 100% Recycled Polyester

Built with 70% recycled polycarbonate

One Ball Unisex Diamond Tuning StOne Ball 40-11-15-11-29 Made from polypropylene and co-polyesterFor de burring and sharpening edges. Inspect and feel your edges. Pull smoothly with light pressure from tip to tail until sharpened or de burred. F For de burring and sharpening edges Inspect and feel your edges Pull smoothly with light pressure from tip to tail until sharpened or de burred. For really sharp edges, use a Fine Diamond Stone S 1. 5" x 3" Black Extra Coarse Blue Coarse Red Fine