This is a 25-pack of standard Size #13 thick, bent tubing for Behind-The-Ear (BTE) hearing aids. It's brand new and comes in its original packaging. This tubing is a common replacement part used to connect the hearing aid's body (which sits behind the ear) to the custom earpiece or dome that goes inside your ear canal. Over time, this tubing can become hard, discolored, or cracked, affecting comfort and sound quality. Replacing it is a simple maintenance task that many hearing aid users do at home. This unbranded pack offers great value, giving you plenty of spares on hand. Just make sure the Size #13 and 'thick' designation match the tubing currently on your specific hearing aid model. A must-have accessory for BTE hearing aid wearers who want to keep their devices functioning comfortably and clearly without frequent trips to the audiologist.