This color chart is divided into 20 color levels, simple and clear, easy to use, easy to clearly record and observe the changes in the color of your teeth. Feature: 1.3D teeth shade guide,Easy use for cold light lamp 2.For comparing teeth shades before, 20 shades with laser engraved 3.Improvement of your own shade management 4.teeth shade guideComes in stylish aluminum case, protable and easy to keep 5.Each tooth can be taken off individually,easy to clean 6.The mirror can reflect the degree of teeth whitening for easier observation 7.Material: Resin,ceramics and aluminum 8.Case Dimension: Appro 8.67*4.72*1.37 inch 9.case weight: 13.52oz Package Includes: Anti-dirty wipes *1 Isolation foam board *1 Aluminum case with mirror*1 20 shades with laser engraved numbering *1