Wacom 6mm Carbon Replacement Nibs for 3rd Generation Bamboo Solo and Duo Stylus, 2 Pack (ACK20610) Carbon fiber replacement nibs that easily attach to the tip of the 3rd Generation Bamboo Stylus, Solo [CS160] and Duo [CS170] Made of durable carbon fiber 2 nibs per pack For 3rd Generation Bamboo Solo and Duo Stylus