• The ring bound style has an extra bit of chain to make the charm drape over the spine of a ring bound planner. It is usually 1 to 1 1/4 inches longer than the TN option.
• The travelers notebook style has the clasp right at the top of the charm. See the measurements below. 
  

Charm Length (not including clasp): 2 7/8  inches
Traveler's Notebook Style Charm Total Length: 3 1/2 inches
Ring Bound Style Charm Total Length: 4 3/4 inches

Shown on Personal Sized Planners.
This item will also work as a bag charm, a purse dangle or a notebook charm. If you would prefer a larger or smaller clasp, just let me know.