precision hybrid ceramic ball bearing designed for fishing reels and other small precision assemblies. This listing covers the models and specifications shown in the title and is sold as a single piece per : SMR128C 2OS 8x12x3.5mm ABEC7 (compatible with MR128 / SMR128 RS / 2RS) and SMR103C2OS 3x10x4mm (BNT2192). Hybrid ceramic construction, rustproof sealing and ABEC7 precision deliver smooth, reliable performance in demanding environments. Key benefits Lower friction and higher speed: Hybrid ceramic balls reduce rolling resistance compared with allsteel bearings, enabling smoother spool rotation and higher RPM. Long service life and corrosion resistance: Rustproof materials and sealing reduce corrosion and contamination from water, salt, and grime—important for fishing and outdoor use. Precise, repeatable performance: ABEC7 tolerance ensures consistent, tight running for better feel, reduced play, and improved casting/retrieval responsiveness. Direct replacement compatibility: Listed sizes and model references (MR128, SMR128, SMR128 RS, 2RS, SMR103C2OS, BNT2192) make it suitable as a dropin upgrade or replacement where those bearings are specified. Key attributes Models / sizes: SMR128C 2OS — 8 x 12 x 3.5 mm (ABEC7) — referenced as MR128 / SMR128 / SMR128 RS / 2RS SMR103C2OS (BNT2192) — 3 x 10 x 4 mm Quantity: 1 piece per (per selected model) Construction: Hybrid ceramic ball bearings (ceramic balls with precision steel races) Sealing: 2OS / 2RS style sealing for improved protection against contaminants and moisture Precision rating: ABEC7 for tolerance and smooth operation Corrosion resistance: Rustproof design suitable for wet and corrosive conditions common in fishing applications Typical applications and use cases Fishing reels: Direct replacement or performance upgrade in spinning reels, baitcasting reels and other fishing gear where compact, corrosionresistant, speed bearings are required. Small precision mechanisms: Ideal for small motors, gearboxes, or precision spindles that require low friction and tight tolerances in a compact form factor. Hobby and RC equipment: Suitable for lightweight rotating assemblies in radiocontrolled vehicles or drones where size and precision matter. Installation and maintenance tips Verify size and model match before installation (8x12x3.5mm for SMR128C; 3x10x4mm for SMR103C2OS/BNT2192). Clean the housing and mating surfaces before fitting to avoid trapping debris inside the bearing. Use appropriate bearing press tools or gentle, even force when installing—avoid hammering directly on the races. For fishing applications, rinse freshwater after saltwater exposure and allow to dry; relubricate if required by your reel manufacturer's service recommendations. Compatibility notes Matches common MR128 / SMR128 / SMR128 RS / 2RS bearing references for 8x12x3.5mm applications. SMR103C2OS (BNT2192) corresponds to 3x10x4mm bearing size often used in compact assemblies. Model listing reminder SMR128C 2OS 8x12x3.5mm ABEC7 hybrid ceramic ball bearing — 1 piece BNT2192 (SMR103C2OS 3x10x4mm) — 1 piece If you need a specific model, confirm the size and model code (SMR128C 8x12x3.5mm or SMR103C2OS 3x10x4mm) before to ensure correct fit and compatibility.