EXCEPTIONAL DESIGN: Sturdy foldable handle allows for a firm grip with flip cover that shields hands from blades. Secure silicone base holds sharpener in place 3-STAGE SHARPENERS: Fine Slot- built-in alumina ceramics for honing your blade’s edge. Medium Slot- Infused with diamond powder to revitalize sharpness. Coarse Slot- Forged with WC-Co hard alloy to restore edge SUPERIOR FEATURES: Extends the life of each knife–keeps edges at their sharpest. Easily stored in any drawer LIMITED LIFETIME WARRANTY: Refer to user manual for troubleshooting steps and questions surrounding warranty policies – this product is BPA free