Our Clay Rolling Frames make rolling metal and polymer clay to precise thicknesses easy! No dirty playing cards to bump into your work. Each Rolling Frame is numbered to correspond to the number of cards in thickness each represents. Clay Rolling Frames offer a working area big enough for the most adventurous project. Outside dimensions are 4" x 7". Clay Rolling Frames are available in 2, 3, 4, 5 6, & 8 card thicknesses. Stack to make just about any thickness of slab you need.