50 LB Bag, Medium Grade, Black Beauty, High Quality, Inert, Low Free Silica, Coal Slag, Low Dusting, Medium Grade Blasting Abrasive, For General Purpose Repair & Maintenance Blasting, Removal Of Paint & Rust, Structural Steel, Mill Scale, General Purpose & Aggregate Exposure, Achieves A 3 To 5 Mil Profile With A Suggested Nozzle Size Of 1/4".