Product Description The interdental brush is designed to remove dirt between teeth that cannot be cleaned with a toothbrush. When in use, it can be extended by attaching it to the sleeve, making it easy to reach the back teeth. After use, it can be stored in this sleeve for convenient portability. There are six thicknesses available to fit different gaps between teeth (SS, S, M, L, LL). Ingredients There are six thicknesses available to fit different gaps between teeth (SS, S, M, L, LL). Caution (Disclaimer) > Please read carefully [Delivery Companies] Yamato Transport Co., Ltd., Sagawa Express Co., Ltd., Japan Post. [Please read carefully!] *For products that can be shipped via mail, non-standard size, Yu-Mail, or letter pack, we will ship using each respective delivery method. Thank you for your understanding. (*Please note that you cannot specify the delivery company or method.) *Occasionally, packages may be damaged during delivery, and we appreciate your understanding in advance. Package designs are subject to change without notice.