These are new 6203-2RS Sealed Ball Bearings (17x40x12mm) - 4 pack - Chrome Steel - ABEC-1. The 6203-2RS bearing is a deep groove ball bearing, designed for high-speed applications. It features rubber seals (2RS) on both sides, providing protection against dust and debris while maintaining low friction and smooth rotation. The bearing is ABEC-1 precision-rated, ensuring consistent performance and durability.

Key Specifications:
- Inner Diameter: 17mm
- Outer Diameter: 40mm
- Width: 12mm
- ABEC Rating: ABEC-1
- Bearing Type: deep groove ball bearing
- Sealing Type: 2RS (Two rubber seals) for maximum protection
- Material: Chrome Steel (SAE 52100)
- Lubrication: Pre-lubricated with high-performance grease
- Load Capacity: Dynamic: 10,000 N | Static: 4800 N
- Speed Limit: Up to 18,000 rpm (grease) | 26,500 rpm (oil)