G23784 - (Pkg 12) Small Foam Roller / Wheel, 18mm Diameter x 14mm
18mm (0.709") diameter x 14mm (0.157") wide foam roller. Outer portion of roller is foam and the inner part is black plastic. Has two 2mm (0.787") diameter x 2mm (0.787") axles on either side. This is perfect for small robots! Sold in a package of 12.