OEM Jawbone Earhook Earloop Ear Hook Loop (standard, 2 pieces) 2 * loops / hooks = 1* standard size for left ear + 1*standard size for right ear 2 * loops / hooks = 1* standard size for left ear + 1*standard size for right ear This is for if your previous earloop has been misplaced or broken and you need a replacment or if you would like to keep an extra one handy. Spare Earloop hook for Aliph Jawbone Bluetooth Headset