What You Get: You receive 12 pieces of nylon garage door rollers; The quantity is sufficient for daily use and replacements, and the rollers are sized to fit most residential garage doors Smooth and Quiet: These garage rollers are made of high-quality nylon material with 6200ZZ bearings, providing smooth operation, high load capacity, strength, and reliability; The nylon material helps reduce noise, ensuring your garage door operates smoothly and quietly Sealed Garage Door Rollers: Designed with reinforced double-wall bearing covers that provide added protection against dust, dirt, and moisture, helping to extend the lifespan of the rollers Fits Size: These black replacement garage rollers have a 1.8-inch diameter for 2-inch tracks and a 4.7-inch long stem; The proper sizing allows for smooth movement on the track and compatibility with most residential garage doors Easy to Install: These black garage door wheels are easy to install and replace; Use a single tool to remove old, worn, or noisy rollers and replace them with these new ones for quieter operation Color: As Shown Material: Nylon Size: 30.30 x 21.79 x 5.21 cm Package Contents: 12 x Roller Note: Light reflection and different display settings may cause slight color variations between the image and the actual item; Measurement may vary by +/- 1-3 cm