Classical: For Classical, Flamenco and 0-sized acoustic guitars.

Medium Jumbo: For OM, 00, 000, Grand Concert, Dobro, Classic and most other mid sized guitars.

Dreadnought: Specifically made for Dreadnought and similar sized acoustic guitars.

Jumbo: For Jumbo sized acoustic guitars such as J-200, including most 12-string Guitars and Archtops up to 17" bottom bout.

Super Jumbo: Designed for the Super 400 and other large Archtops.