A thin film of pure formvar resin coats a single hole grid.. Gilder finder grid. F1 Type. 10nm thick. Copper. Pack of 25. EMS CF200F1-Cu-25 Carbon Support Film, Gilder Finder Grid, F1 Type, 10nm Thick, Copper, Pack of 25. Country of Origin : United States. Part Number : 1171F10PK. Pack of : 25.