OLFA 28mm Rotary Cutter Replacement Blades, 10 Pack (RB28-10): These blades are made from high-quality tungsten tool steel for unparalleled sharpness and superior edge retention. The long lasting precision of these blades allows you to work longer uninterrupted. Each refill pack contains 10 ultra-sharp 28mm rotary replacement blades. Our RB28-10 28mm Rotary Blades are compatible with most 28mm rotary cutters. However, these circular blades perform best when equipped with an OLFA 28mm Rotary Cutter and an OLFA Cutting Mat. Great for cutting of fabric, paper, leather, and more for small-scale projects, miniatures, and tight corners. Perfect for cutting shapes, strips, and pieces for quilting, sewing, and crafts. About OLFA: Ever since Yoshio Okada, the founder of OLFA CORPORATION, invented the world's first snap-off blade cutter in 1956, OLFA has been committed to developing practical and safe hand-held cutting tools. OLFA brand blades are made with top quality materials, forged with technologies that stem from traditional sword-making, sharpened with technologies that give a blade life, and ultimately finished with the craftsmanship that brings all of this together. The holders and handles that allow users to gain the full cutting performance of these high-quality blades are designed, developed, and manufactured in Japan and subjected to stringent quality checks throughout the process. OLFA is proud of the unwavering quality that goes into every product it makes.