Black and Red Replacement Pen ONLY FOR: SPNL-6000 Series Use this table to determine what pen you need. Each SMART interactive product comes with one or more pens specifically designed for that product, which you can use to write or draw in digital ink. Using a pen from different SMART product can cause unexpected behavior, such as broken digital ink lines or intermittent contact detection. For this reason, it is important to use pens designed for your SMART product