Whether you're looking for more bite or more glide, we offer a range of blade hollows to helpyou optimize your on-ice performance. Only use PROSHARP BAUER ADVANTEDGE GrindingWheels with the PROSHARP BAUER ADVANTEDGE Skate Sharpener. Use of any othergrinding wheels may damage the machine and void warranty. CHOOSING THE RIGHT GRINDING WHEELS: There are two types of wheels you will use when sharpening your skates: Hollow GrindingWheels and FLAT Grinding Wheels FLAT Grinding Wheels are designed to "reset" your blade. This process is important whenprepping new steel or refreshing your blade if you damage your edges.On average, a grinding wheel will sharpen about 75 pairs of skates. Your PROSHARP BAUERADVANTEDGE Skate Sharpener will notify you when it's time to replace your grinding wheel. On average, a grinding wheel will sharpen about 75 pairs of skates. Your PROSHARP BAUERADVANTEDGE Skate Sharpener will notify you when it's time to replace your grinding wheel