The Olfa 45mm Roll Cutter is the most popular size available on the market. It has a durable handle with a collar for the blade that ensures safety during transportation. The Roll Cutter is a rolling knife blade used to cut various materials in many shapes, such as strips for sewing and quilting projects.such as strips and pieces for sewing, quilting and patchwork projects. The blade is made of high quality knife steel that provides unrivaled sharpness and superior edge retention. Designed for both right and left handed users.