What You Get: You will 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: The nylon rollers feature 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 designed for 2-inch tracks with a 4.7-inch long stem; The correct size allows for smooth movement along the track and compatibility with most residential garage doors Easy to Install: These black garage door wheels are easy to install and replace; Simply use one basic 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 Only the above package content is included; other items are not part of this package Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product; Measurement may vary by +/- 1-3 cm