Features Size: Miniature ball bearings are very small ball bearings available. These miniature ball bearings have an inner diameter of 5 mm, an outer diameter of 11 mm and a thickness of 4 mm. Precise parts: bearings are widely used and are economical standards, well suited for precision work and applications that require a large number of functional mechanical parts in a small space High speed: Steel double shielded miniature ball bearings have stable performance, easy to use, less friction, faster speed and more durable, improve the efficiency of mechanical work to a greater extent Non-contact double rubber seals: Double shielded deep groove bearings use special non-contact double rubber seals to hide dirt when present, and have no friction performance. Easy to Install: Steel deep groove ball bearings are easy to install and replace, weigh only 8g and can be used in machines such as 3D printers, quadcopters or models Miniature ball bearings are available ball bearings of quite small dimensions. These miniature ball bearings have an inner diameter of 5 mm, an outer diameter of 11 mm and a thickness of 4 mm. Ball bearings of this size are perfect for precision work and applications that require many functional mechanical parts in a small space, such as a 3D printer, quadcopter or model. Features: 1. Deep Groove Ball Bearings 2. Widespread bearing, economic and standard 3. Less friction, higher speeds and durability 4. Special non-contact double rubber seals to hide dirt during application. frictionless performance. 5. Easy installation replacement Specifications: Material: bearing steel Model: MR115-2RS Color: As the picture shows Size: about 5*11*4mm(ID*OD*H) Weight: 16g Quantity: 10pcs Note: Please allow 1-3mm error due to manual measurement. Please make sure you don't mind before bidding. Package Included: 10 x bearings Package List