Make Secure Mean Something. Replacement Black Coiled Audio Acoustic Tube with Earbud Ear Mold (Eartip) for Two-Way Radio Surveillance and Listen Only Earpieces. This acoustic tube has the twist lock connector one the end (see picture). Compatible with most brands. This is a complete acoustic tube kit that includes the tube, clear mushroom style ear tip, twist connector (locks tube into earpiece transducer amplifier), elbow connector that plugs into eartip. In addition to the tube you will receive (2) Black Right Medium Ear Molds Please check out my other listings for additional ear molds sizes fits and acoustic tubes. ALWAYS FREE SHIPPING