PREMIUM NYLON MATERIAL - Our garage door rollers are crafted from high-quality nylon and feature 6200ZZ bearings, offering superior durability and reduced noise compared to metal rollers. They provide a smoother operation and are ideal for 2-inch garage doors. HIGH-LEVEL DESIGN - The nylon roller stems are coated to resist rust, and the reinforced double-wall bearing cage along with sealed 6200ZZ ball bearings ensure excellent performance and an extended lifespan, capable of over 10,000 cycles under a 150-pound load. MORE STABLE AND QUIET - The smooth rotation of the 6200ZZ ball bearing and the noise-reducing nylon significantly lower garage door noise by up to 75%, allowing for quiet and efficient operation. EASY TO INSTALL AND STANDARD SIZE - Installation of these garage door wheels is simple. Replace old, noisy or damaged rollers with our quiet options. The rollers measure 1.81 inches in diameter and 1/2 inch in thickness, compatible with 2-inch tracks. Colour: White Material: Nylon + Metal Size: 120x46mm Package Contents: 12 Nylon Garage Door Rollers Note: Light differences in display may affect item color. Measurement error is allowed within +/- 1-3cm.