Serious skiers, this Swix diamond stone is what you need for that perfect edge polish! The 100mm blue stone delivers extra-fine 1000 grit performance that creates incredibly smooth, razor-sharp edges on your skis. This isn't for repairing major damage - it's for that final polishing touch that makes your edges glide effortlessly through snow. The 2016 updated design from Swix Racing Pro line represents the latest in ski tuning technology. Here's how the color coding works: black stones (100 grit) handle heavy damage repair, red (200 grit) does light cutting to reestablish edges, yellow (400 grit) is for routine maintenance, white (600 grit) deburrs and polishes, and this blue beauty (1000 grit) delivers that ultra-smooth professional finish. The diamond abrasive surface cuts quickly and evenly, maintaining consistent performance throughout the stone's life. Perfect for racers who need every performance advantage, or recreational skiers who appreciate perfectly tuned equipment. Using this after your other tuning steps gives you edges that bite perfectly on hard snow while releasing smoothly in turns. The compact size makes it easy to carry in your tuning kit for quick touch-ups at the mountain. Whether you're maintaining your own gear or tuning for others, this professional-grade stone delivers results you can feel on your very first run. That feeling when your edges perfectly engage and release? That's what this stone delivers - pure skiing joy through perfectly tuned equipment!