This prism bar set includes both a vertical and horizontal prism bars. The vertical prism bar has 0.5, 1, 1.5, 2, 3, 4, 5, 6, 8, and 10 diopters. The Horizontal prism bar has 1, 2, 4, 6, 8, 10, 12, 15, 20, and 25 diopters. Comes with dual sleeve leather case. Manufactured by Bernell. Comes as 1 set.