SMR117 Stainless Steel Bearing – Stainless steel races with silicon nitride ceramic balls. Delivers up to 15-21% casting distance gains, 50% faster spin than standard steel bearings. Pre-lubricated, sealed, corrosion resistant. The ultimate upgrade for Shimano, Daiwa, Abu Garcia, Penn, Okuma, and Lews fishing reels. Technical Specifications & Design Features Model: SMR117 (Hybrid Ceramic) Inner Diameter (d): 7 mm / 0.276 in Outer Diameter (D): 11 mm / 0.433 in Width (B): 3 mm / 0.118 in (2.5 mm variant also available) Ring Material: AISI 440C Stainless Steel Ball Material: Si3N4 Silicon Nitride Ceramic (Grade 5) Grade / Precision: ABEC-5 / ABEC-7 (depending on variant) Limiting Speed (Grease): 45,000–50,000 RPM Corrosion Protection Excellent – AISI 440C + ceramic balls (fully non-rusting) Maintenance Pre-lubricated, low maintenance