RTY-1/G is designed for small scale projects, miniatures and corners. Use replacement blades number RB/28.
RTY-2/G, the most popular size, is designed for general quilting, sewing and craft projects. Use replacement blades number RB/45.
RTY-3/G is Olfa's largest cutter and can accurately cut up to six layers of fabric. Use replacement blades number RB/60.
NOTE: all cutters can be used left or right handed. Always use with care as blades are sharp and always always recover blade when not in use!