The eartip has a bore size of 4.5 mm, which fits earphones with a sound port nozzle of 5-6mm. (Mostly with BA drivers) Comparable to Comply T-500. Compatible with AKG N30, AKG N40, and 1More E1001 Triple Driver. Included in the box for AKG N5005. The package contains 2 pairs of silicone replacement eartips (4 pieces)