The Singer ProSeries Flip ‘n Mark is perfect for hobby sewists and quilters. No need to rummage through sewing supplies when switching between different tracing wheels. This multitool contains one serrated edge wheel and one smooth edge wheel. Use the wheels together to mark parallel sewing and cutting lines 0.25 inches apart or separately. Instructions: 1. Work on protected hard surface 2. Mark on wrong side of fabric following instructions on transfer paper package 3. Apply even pressure holding fabric taut in front of the tracing wheel.