4'' Keel Roller with PVC materail. 4'' Keel RollerLength:102mmMaterial:PVCWeight:0.3kg/pcBore:Φ18mmColor:red,blue or whiteOthers:We manufacture various kinds of rubber rollers, plastic rollers,nylon rollers,PVC rollersVarious rollers with different sizes and different outlooks are available.wobble roller,keel roller.....If you are interested in our rollers,pls feel free to contact me!