The all new Comandante C40 Nitro Blade is an amazing precision grinding instrument. The advanced burr design and precision gives a consistent level of grind beyond expectations. The burrs are a piece of art. Using high alloy and high nitrogen stainless steel the burrs are made on from one block of steel. Using german engineering of the highest order, the burrs are extremely tough, sharp, highly wear resistant and high degree of edge retention. The centre axel is fixed and supported by two micro ball bearings for better distribution of force and grinding action. All plastic parts are made Tritan BPA free plastic. The grind selection dial is a three legged star with click indentations to hold your chosen grind setting. Turn clockwise for finer grind and anti clockwise for coarser grind. Its comes with 2 jars. One dark coloured glass jar with lid and one clear glass jar.