Premium, aluminum oxide mineral, an improved paper backing and an optimized construction. Performance advantages: Improved rate of cut, increased abrasive life, increased flexibility, and uniform, consistent finish. Used in wet sanding, use for scuffing the blend area prior to painting. 50 sheets per sleeve, 5 sleeves per case. 9" x 11" Abrasive backing type: paper; Abrasive backing weight: A weight; Abrasive material type: Aluminum Oxide; Color: black; FEPA grade: P600; Length: 11"; Primary trademark name: Imperial; Width: 9"