Features 1、Self-explanatory, easy to use, convenient to compare. 2、20 Colors shades with engraved numbering for longer use. 3、Quick, secure and precise shade determination. 4、For comparing teeth shades before & after bleaching. 5、Comes in stylish aluminum case, portable and easy to keep. Specification Features: Self-explanatory, easy to use, convenient to compare. 20 Colors shades with engraved numbering for longer use. Quick, secure and precise shade determination. For comparing teeth shades before & after bleaching. Comes in stylish aluminum case, portable and easy to keep. Specification: Material: Plastic Weight: 445g Color: Black Size: 18*8.5cm/7.09*3.35in Package Includes: 1 x Teeth Whitening Dental Shade Guide Note: 1. Please allow 1-3mm 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 the real object. Please take the real one as standard. Package List