Feature: Brand new and high quality. For comparing teeth shades before, 20 shades with laser engraved numbering for longer use. Improvement of your own shade management. Comes in stylish aluminum case, protable and easy to keep. Material: Rsin and aluminum For comparing teeth shades before & after bleaching, shows your patients about your teeth whitening treatments helpfully 20 shades with mirror case, more professional. Laser engraved numbers are easy to read and longer lasting use The shade tabs can be heat-sterilized in the autoclave up to a max temperature of 140 orcold-sterilized by using a suitable disinfectant The shade guide base is only suitable for surface disinfection. Note: the plastic parts of the shade guide are not resistant to monomersNote: the plastic parts of the shade guide are not resistant to monomers