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 has a galvanized coating to prevent rust. The reinforced double-wall bearing cage and sealed 6200ZZ ball bearing provide excellent performance and extended service life. These garage door rollers can withstand over 10,000 cycles under a load of 150 pounds. MORE STABLE AND QUIET - The 6200ZZ ball bearing on the nylon garage door wheels rotates smoothly, and the high-quality nylon material greatly reduces noise, reducing garage door operating noise by up to 75%, ensuring smooth and quiet 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 our new quiet 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: 120x46mm Package Contents: 12 x Nylon Garage Door Rollers Note: Light and display settings may cause slight variations in color. Measurement allows an error of +/- 1-3 cm.