Bizerba STONE SET STONE SET. PRODUCT INFO: SHARPENING STONE SET, BIZERBA BZST1, SE 8, SG. 8D, A330 MSRP: Price: 2099-12-31 $33.33 This is a set of four stones that are used to practice meditation. The stones are smooth and round, and they are made of a hard material that is not easily damaged. Add to Cart Add to Cart