The Wusthof Sharpening Guide "Slider" is a wedge-shaped slider with structured silicone surface. The pre-set 14 angle ensures that the knife always maintains a consistent angle from the tip to the end of the blade. The soft silicone surface prevents the blade from getting scratched. The underneath of the slider has a layer of Teflon to ensure it glides smoothly over the whetstone. The ergonomic shape of this practical sharpening aid fits nicely in the hand. Easy to use. Particularly suitable for wider blades. Makes sharpening easy and effortless even for the layman!