Roll the Gold. Titanium Coated Rotary Cutting Blades. These steel replacement blades are coated with Titanium Nitride which means they retain a sharp edge longer so you can cut more. These 45mm blades will fit in most popular rotary cutters and are perfect for a variety of sewing and crafting projects. This package contains ten 45mm blades in handy little storage case. Caution: Blades are extremely sharp: handle with care.