5ml Calvins Lube Silicone Oil Medium Viscosity in Syringe for Twisty Puzzle Cube Silicone Lube in Syringe for speed cubing (Medium Viscosity) Helps make the cube feel smoother without destroying the plastic Lube the core by adding it to washers, springs and screws Lube the area where there's friction between the plastic pieces One or two drops is enough or else the cube would feel gummy