3 Replacement T discs;Compatible with the Adonit Jot Pro, Jot Flip, Jot Mini, and Jot Touch 4;NOT compatible with the First Generation Jot Pro or Jot Flip;If you're not sure which disc you need, please contact Adonit customer service;This is a Adonit replacement part;Part Number N/A;This is an aftermarket of generic part