3M Diamond Lapping Film 661X, 30.0 Micron Roll, 4 in x 50 ft x 3 inASOGeneral Information Brand 3M Attachment Type Plain Back Product Series 661X Country Of Origin United States Sold As Case California Residents Proposition 65 Warning Return Policy NCNR Non Cancellable Non Returnable Dimensions and Specifications Backing Thickness (Imperial) 3 mil Backing Thickness (Metric) 0. 076 mm Micron Grade 30 m Overall Length (Imperial) 50 ft Overall Length (Metric) 15. 24 m Overall Width (Imperial) 4 in Overall Width (Metric)