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. Ideal 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 ensure superior performance and extended service life. These rollers can withstand over 10,000 cycles under a 150-pound load. MORE STABLE AND QUIET - The 6200ZZ ball bearing allows smooth rotation, while the high-quality nylon material significantly reduces noise, lowering garage door operation noise by up to 75%. Ensures quiet and smooth garage door movement. EASY TO INSTALL AND STANDARD SIZE - These garage door wheels are easy to install and replace. Replace old, worn, noisy, or damaged rollers with our new quiet rollers. The actual wheel diameter is 1.81 inches, and roller thickness is either 1 or 2 inches, compatible with standard 2-inch garage door tracks. Color: White Material: Nylon and metal Size: 120x46mm Package Contents: 12 Nylon Garage Door Rollers Note: Other products are not included. Lighting and display differences may cause slight variations in color. Measurement may vary by 1–3 cm.