-14 slots for cutting or tracing curved shapes for quilting-slots range in size from radius of 1 1/2" - 8"-lines on the ruler indicate placement of fabric for cutting concave and convex shapes (quarter circle, half circle, full set-in circle, orange peel).-transparent non-slip surface on back of ruler-instruction insert includes basic directions for use plus a quilt pattern for beginners-slots for sizes 1 1/2" - 3 1/2" are slightly wider, intended for use with pencil to make EPP or applique templates, mark quilting designs, curved corners, or scallop edges. These slots will also accommodate a blade for cutting.-slots 4"-8" are standard cutting grooves intended for use with typical rotary cutterMade of: AcrylicUse: Quilting Ruler