Schacht-Reeves and Matchless use cotton drive bands only for Scotch tension, bobbin lead, and double drive modes. The package contains enough material for 3 drive bands.
Flatiron takes an 80-1/2" poly drive band (Scotch tension or bobbin lead) or cotton band (double drive).
Ladybug takes a 54-1/2" poly drive band (Scotch tension or bobbin lead) or cotton band (double drive).
Sidekick takes a 58" poly drive band for Scotch tension.