Hi-Unit Hi-Unit Wired Piyahon 1 Pierre Nakano x Hi-Unit Gunmetal HSE-A1000PNK-G Wired earphones with a 10mm driver and aluminum housing. - Model: Hi-Unit Piyahon - Driver Size: 10mm - Plug Type: 3.5mm stereo mini plug - Housing Material: Aluminum - Accessories: Silicone ear tips (S/M/L) - Impedance: 16Ω - Frequency Response: 20Hz - 20kHz - Sensitivity: 100dB Purchased new this month, but selling because they didn't suit my needs. Used them 2-3 times. The sound is clear. Will disinfect with alcohol before shipping. Thank you for looking.