Zinc is rigid, so a saw is required to cut it accurately. You can cut it with a pair of dykes; however, it's challenging to do so cleanly. Zinc is for framing finished pieces; for copper foil projects, it is primarily cosmetic, only adding a small amount of strength. For lead came projects, it aids in keeping the lead sound by providing a rigid frame.
3/8" face with a 9/64" channel. Zinc framing is sold per 6ft stick or by 22 lb. case. A case contains 44 (6-foot) sticks.