These are professional tooth color contrast cards. Made of , and practical for use. Simple, smooth, portable, easy to use, easy to control. It has unique appearance design and fluent outline. Features -Color: Assorted Color. -Material: Paper. -Size: About 10.00X4.00X0.20cm/ 3.93X1.57X0.08in. - Adopted of , the tooth color cards are practical for use. - In order of shadow value, make you easy to see the teeth whitening effect. - Though it has simple appearance, it is very practical. Simple and easy to compare teeth whitening effect. - The creative design will give you a wonderful experience and bring you a good mood. - By writing the color contrast of the teeth before and after whitening on the card, you can better judge whether the whitening is effective. Package list: Tooth Shade Cards