NEWS – The Tumbler Knife Sharpener is a can-shaped sharpener with a diamond disc surface on one end, and a stainless steel surface on the other end. The unit includes a 15° and 20° magnetic blade guide that holds the knife as you roll the ‘can’ along the knife edge. Only serrated-edge knives and scissors are not suited to the Tumbler sharpening method. And probably knives you know have a blade edge at some angle other than 15° or 20°. The Tumbler Knife Sharpener is currently priced at $98.00 on tumblerware.com where you can order and find more information about this knife sharpener.