Black Line

Flat jaws and high bow for longer premolars.

Slightly festooned jaws for upper premolars.

Deeply festooned jaws for canines and premolars.

Flat jaws for premolars.

Small, flat jaws with stiff bow for lower molars.

Flat jaws for larger premolars.

Flat serrated jaws for larger premolars.

Flat jaws for premolars.