Features: 1.Teeth shade guide : 20 shades with mirror case. Laser engraved numbers,easy to read and long lasting. 2. Note : tooth shade guide base is only suitable for surfaces disinfection, plastic parts of dental teeth shade guide are not resistant to monomers. 3.Use : 3D R-20 Tooth whitening shade use for comparing teeth shades before & after bleaching,Express more accurately. 4.High quality and easy to carry : Teeth whitening shade guides comes in stylish aluminum case with mirror, portable and easy to keep. Description: The tooth shade guide base is easy to carry and easy to operate,and it comes in stylish aluminum case, portable and easy to keep. Specifications: Size:18.5*8.5cm Case material:aluminum Package Included: 1 * Teeth Whitening Set Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.