OLFA Wave Cutter Replacement Blades Diameter: 28mm Bainite Steel Blade Part No. XB49 2 blades per pack × 2 packs This size is not listed in the OLFA catalog, so it may be a discontinued product. I am not very familiar with it, so please purchase if you know its use. Although it is a new, unused item, please note that the packaging may have some discoloration or damage due to aging.