The Coloud in-ear Active Designer Headphones Include S, M and L replacement silicone caps for a custom fit Model: C19M Driver Unit: 9 mm Handmade Drivers Frequency Range: 20.0 Hz~20.0 KHz Impedance: 16 ohms1KHz Sensitivity: 107 dB Max Input Power span: 5 mW Plug Size: 3.5 mm Microphone type: Unidirectional electret Size: S,M,L silicone ear caps I have two headphones in Black and Grey color. MSRP: $30 Asking: $15 (or buy both colors for just $25)