The Blitz Watch Care Kit is specially formulated for the care of gold, silver, platinum and leather watches. Not for use on porous gems and pearls. The 10cm by 15cm polishing cloth cleans and restores the original brilliance to your watch face. The 10cm by 15cm silicone leather cloth cleans and protects your leather watch bands. The Blitz Foamz cleaner deep cleans your metal, diamond and gemstone jewellery without the mess. The 20cm by 20cm microfiber cloth cleans and takes special care of crystal faces. These cloths are designed to be lint free and not scratch or damage your watch face. Non-Toxic.