Upgrade your fishing reel's performance with these precision-engineered MR104 ball bearings. Each set includes 10 pieces of high-speed stainless steel bearings, measuring 4x10x4mm. These compact yet durable bearings are designed to provide smooth, consistent operation in fishing reels, helping reduce friction and enhance overall casting and retrieval experience. The stainless steel construction offers excellent corrosion resistance, making these bearings ideal for use in marine environments. Their precise dimensions ensure a perfect fit for compatible fishing reels, while the high-speed rating delivers reliable performance when you need it most. This 10-piece set gives you plenty of replacements for maintenance or upgrades to multiple reels in your collection. 10Pcs MR104ZZ Miniature Bearings Ball Mini Bearing 4 x 10 x 4mm. These are 4x10mm ball bearings also known as a size MR104 ball bearing. Stainless Steel Balls, HSR inner cage technology and shielded on both sides. These are very popular as 4x10mm fishing reel bearings allowing you to cast farther and longer but can be used anywhere a 4x10x4mm bearing is required: 100% stainless construction, no need to disassemble and degrease. D (Outside):10 mm d (Inside) Bore:4 mm B (Width):4 mm Wgt:0.55 g per pc Vibration Level:V1- Above standard and less than V2 Shield/Closure codes:ZZ (Two side metal shields) Wide Temperature Range: - 20 C to 120 C Qty:10pcs 10 x Ball Bearing MR104ZZ