What's in the box:

1 X Creality 3D Printer Plastic Pulley Passive Round Wheel Roller with Bearing Idler Pulley Gear Perlin Wheel for CR-10 Series Ender-3, 13pcs, 13pcs

Features:
13 pieces of passive round pulley for CR-10 series (CR-10/CR-10mini/CR-10S/CR-10S4/CR-10S5) and Ender-3 3D printers.
Inner diameter: 6mm/ 0.2 inch, outside diameter: 25mm/ 0.98 inch.
Made of high-quality material, rust resistant and wear resistant.
Fine workmanship and high-precision within 0.005mm error.
Smooth motion and low noise, excellent friction resistance and operate smoothly.

Specifications
Quantity: 13pcs
Compatibility: Ender-3/ CR-10 Series (Including CR-10/CR-10mini/CR-10S/CR-10S4/CR-10S5)
Inner Diameter: 6mm / 0.24in
Outside Diameter: 25mm / 0.98in
Thickness: 10.4mm / 0.4in
With Bearings: Yes
Item Weight (each one): Approx. 13.2g/ 0.46oz
Package Size: 13 * 9 * 1cm / 5.1 * 3.5 * 0.4in
Package Weight:
1pcs: 15.6g/ 0.55oz
13pcs: 173g / 6.1oz

Package List:
13 * Pieces of Pulley