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 reliable performance and extended service life. These garage door rollers can withstand over 10,000 cycles under a 150-pound load. MORE STABLE AND QUIET - The 6200ZZ ball bearings rotate smoothly, and the high-quality nylon material significantly reduces noise, helping reduce garage door operating noise by up to 75%, ensuring quiet and smooth operation. EASY TO INSTALL AND STANDARD SIZE - These garage door wheels 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 0.5 inch, compatible with standard 2-inch garage door tracks. Color: White Material: Nylon + Metal Size: 120 x 46 mm Package Contents: 12 x Nylon Garage Door Rollers Note: The package includes only the items listed above. Other products are not included. Due to lighting and display differences, the color may vary slightly from the actual item. Measurement allows an error of +/- 1-3 cm.