Usage Tips:12 packs of nylon garage door rollers, replace your old, noisy or damaged segmented track style garage door parts with our quiet and garage door nylon rollers The garage door roller is made of white nylon, which is softer and quieter than plastic or metal rollers 11 reduce the rotational friction between the rollers and the shaft, making the opening and closing of the garage door quieter and smoother The size of the garage door roller matches that of most residential garage doors, making it easy to install and effectively extending the service life of the garage door roller over 100000 times Package includes 12 white garage door rollers, 4-inch nylon garage door (recommended lubrication, not included) Colour:White Material:nylon Size:45mm x 105mm Package Contents: 12 x garage door rollers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.