The earphone case is made of silicone material. It can cushion the impact when the earphones fall. Case for Bose Ultra Open Earbuds, Full Protection Cover, Silicone Case with Carabiner + Strap, Carabiner Included, Shockproof, Waterproof, Dustproof, Can be Charged While Attached, Full Protection, Scratch Prevention, Headphone Case for Bose Ultra Open Earbuds In-Ear Headphones [Green] The model name is listed on the package, and the product is listed based on self-measurement. Please be sure to check the size carefully before purchasing. * Immediate purchase is welcome, and silent purchases at midnight are OK ◎ * Welcome to bulk purchases, please feel free to comment * Free shipping! ・Please understand that the product will be stored at home and shipped in simple packaging. It may be shipped without the box. #erinko product list is here ✨ 28-40(0521)