... engraving machine 1.specially for Jade material 2.frequency spindle cooled by water 3. perfect design Mars mini bowlder cnc engraving ... and good durability,Rotary parts is optional which is for engraving cylinder material.Available materialCopper, aluminum, jade, acrylic, ... double-color plates, organic glass, PVC boards, ABS wood , ox-horn,and various non-ferrous metals.Application field ...