What You Get: You will receive 12 nylon garage door rollers. This quantity is sufficient for daily use and replacements, and the rollers are sized to fit most residential garage doors. Smooth and Quiet: These garage door 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 quiet and smooth garage door performance. Sealed Garage Door Rollers: Designed with reinforced double-wall bearing covers, these rollers offer added protection against dust, dirt, and moisture, helping to extend the life of the bearings. Fits Size: These black replacement garage door rollers have a 1.8-inch diameter and are compatible with 2-inch tracks. They feature a 4.7-inch long stem, allowing for smooth operation on the track and compatibility with most residential garage doors. Easy to Install: These black garage door rollers are easy to install and replace. Using just one simple tool, you can 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 displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.