Specification Brand : Algrium BulletPoint1 : Brown Fused Aluminum Oxide is a brown aluminum oxide obtained by a reduction fusion of high quality bauxites in electric arc furnaces. BulletPoint2 : Very Tough: Hardness Rating of 9 on the Mohs scale BulletPoint3 : It is therefore perfect as a rock tumbling media. BulletPoint4 : Can be used in Vibratory or Rotary Tumbler equipment. BulletPoint5 : All tumbling medias are new, not reclaimed. Color : Black CompatibleMaterial : Metal CompatibleMaterial1 : Metal CompatibleMaterial2 : Glass ExternallyAssignedProductIdentifier : 4514277485553 ExternallyAssignedProductIdentifier1 : 0607174138906 ExternallyAssignedProductIdentifier2 : 607174138906 ItemDisplayWeight : 1 pounds ItemName : .25 Lb.(4 oz.) 220 Grit - Medium Aluminium Oxide Rotary Vibratory Rock Tumbler Tumbling Polishing Powder Abrasive Grit ItemPackageQuantity : 1 ItemTypeKeyword : abrasive-tumbling-media Manufacturer : Algrium Material : Aluminum Oxide NumberOfItems : 1 PartNumber : 4514277485553 ProductDescription : Product Specifications: *Manufacture: Manufactured in USA *Model: Aluminuim Oxide 220 Grit ProductSiteLaunchDate : 2020-08-30T21:44:18.727Z UnspscCode : 31191600