PREMIUM NYLON MATERIAL - Our garage door rollers are made of high-quality nylon material and 6200ZZ bearings, which are sturdy and durable, more stable and quieter than metal rollers and other materials, and smoother than previous rollers. Suitable for 2-inch garage door tracks. HIGH-LEVEL DESIGN - The stem of the nylon garage door roller features a galvanized coating to resist rust. The reinforced double-wall bearing cage and sealed 6200ZZ ball bearing design ensure high performance and extended service life. These rollers can withstand over 10,000 cycles under a 150-pound load. MORE STABLE AND QUIET - The 6200ZZ precision ball bearing allows smooth rotation, and the high-quality nylon material significantly reduces noise, helping to reduce garage door operating noise by up to 75%, ensuring quiet and smooth operation. EASY TO INSTALL AND STANDARD SIZE - These garage door rollers are easy to install and replace. Replace old, worn, noisy, or damaged rollers with these quiet, new rollers. The actual roller diameter is 1.81 inches and thickness is 1/2 inch, compatible with standard 2-inch tracks found in most garage doors. Color: White Material: Nylon + Metal Size: 120x46mm Package Contents: 12 x Nylon Garage Door Roller Note: Light and display differences may cause slight color variation between the image and actual item. Measurement allows an error of +/- 1-3 cm.