The Nano Compact is designed with a compact head of 1.7 cm that allows you to brush even the hardest parts of the back teeth. It has a clean and clear color. * With cap ■ 0.01mm ultra-fine bristles, gently and firmly polish The soft ultra-fine bristles with a tip of 0.01 mm, which is a feature of Target Sensitivity, can reach the gap between the teeth and the gums without damaging the gums, and can be thoroughly cleaned without using toothpaste. [All 4 colors available] The colors of the assortment set are random. It cannot be specified. Thank you for your understanding.