This prism set includes 22 individual prisms and a red lens. Prism powers are 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 45, and 50. Comes with a durable storage case. Manufactured by Gulden. Comes as a set.