About this item Eartip has a bore size of 4.5 mm which fits earphones that have sound port nozzle 5-6 mm. (Mostly with BA drivers) Comparable to T-500. Compatible with N30, N40. Included in the box for N5005. Package includes 2 pairs of silicone replacement eartips (4 pieces). Dimensions: 0.5 x 0.5 x 0.4 inches.