50FT Cat 6 550MHZ Blue without boots Enhanced Audio Performance - Hear your music the way it"s supposed to be heard, with all its highs, mids and lows funneled directly into the ear. Comply Foam Tips let you hear the pure acoustic signature each earphone was designed to deliver Specifications - Medium - 12.45 mm +- 0.50 mm (0.490 +- 0.020) Materials - Polyurethane Foam, Thermoplastic Elastomer (All RoHS Compliant) Inside Diameter of Core - Depends on earphone design Compatible earphones - AKG - K-330; AUDIO-TECHNICA - ATH-CK70 PRO, ATH-CK303; DIGIFI - Opera S-2,Opera S-5; KOSS - KDX-200; M-AUDIO - IE-10, IE-20XB, IE-30, IE-40; ME-ELECTRONICS - M-6; SENNHEISER - CX-281, IE-6, IE-7, IE-8;ULTIMATE EARS - Super.Fi 3 Studio,Super.Fi 5 Pro, Super.Fi 5 EB, Triple.Fi 10/10vi; WOODEES - IESW-100B w/ Mic, IESW-101B