Check the listing for details. 4x10x4mm Ball Bearing Stainless 10pcs MR104 Bearing 4x10mm Fishing Reel Bearing. Condition: New. Listed at 14.99 USD. World Champion ACER Racing Stainless 4x10x4mm Ball Bearings 10 pieces per order as shown. 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. Lubricated with lightweight and 100% synthetic American ACER Racing SIN oil for fast and super smooth action. True high precision ABEC 5 rating. 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 as they come oiled with the best synthetic oil. Also available in Ceramic under a different eBay listing. FREE SHIPPING