These inserts were used with a portable audiometer. Link Foam Ear Tips and Inserts E. TONE 3A 10 ohm for audiometer" is in sale since Sunday, January 28, 2018.
This item is in the category "Sporting Goods\Hunting\Range & Shooting Accessories\Hearing Protection". The seller is "buickt68u" and is located in Rosemount, Minnesota. This item can be shipped to United States.