We have Kai 28mm, 45mm, and 60mm Rotary Cutter Blades for immediate shipping. These blades are made out of high quality tungsten steel, and are the longest lasting blades in the industry. Yes, they will fit other manufacturers’ rotary cutters too. Our Kai Rotary Cutters are ergonomically designed and are ideal for fabricating face masks. Please shop us at www.scissormanusa.com. We are also running a 10% off sale on all our scissors and shears through the end of June.