The ability to always have a sharpening kit with you, even in your wallet.Each stone is housed in a colored vinyl case for quick identification of the stone's grain.The "credit card" measures make them comfortable to carry but still of suitable dimensions for each bladeKnives are considered as sharpening and cutting tools, therefore their sale and possession are absolutely free (Art.4 Law 110/1975 and ART.45 6 May 1940 n. 635).