Siemens, Costco, Rexton, Signia Medium Closed Click Sleeve - 6 Pack

To account for the different sizes of ear canals, three click sleeve sizes S, M, L are offered. To take different amplification needs into account, all three sizes are available in both closed and vented versions. In the closed version, used for higher amplification needs, a small vent of 0.8mm diameter and 4mm length realizes an equivalent vent size of 1.6mm diameter and 16mm length. In the vented types, two short openings are incorporated on both sides, providing an equivalent vent size of 16mm length and >4mm diameter. Pack of 6 Sleeves Color of sleeves may be black or clear