Outside diameter of rolls: 3" (1" core).  Badge size: 3.9375" x 2.3125".  # badges/pack: 1,000 (4 rolls of 250 badges) 

Choose a clip-on back piece, or self-adhesive back piece. Your choice of back piece is included in the price.

Two-Piece Activation. To activate the color-changing process, remove the white Front Piece from your printer and attach it to the red Back Piece.  This starts the timing process.