1.IMPROVED DESIGN - The Rollers feature an innovative design with 11% more surface area in the 360 degree roller that spins 2000 times/minute while pampering your feet; 2.SOFT FEET & SUPREME DURABILITY - Our rollers are made from specialty quartz crystal micro mineral designed for long-term use and durability, lasting longer than other brands. The mineral Clear Quartz is known to be soothing to the skin by eliminating blistering. 3.PROFESSIONAL RESULTS: Enjoy professional spa-quality results in the comfort of your own home Say good-bye to pumice stone and hello to smooth and healthy feet Watch years of callused skin give way to baby-soft skin in just minutes 4..Safer than grater-like or pumice stone products. 5.TRIPLE TESTED QUALITY: Carefully Selected Materials and Expertly Manufactured Products.