Two pieces a set with a piece of horizontal type and a piece of vertical type,packed with aluminium case.

Vertical  Diopter:1,2,3,4,5,6,8,10,12,14,16,18,20,25,30  (total 15 diopters)

2. HB-16

Harizontal Diopter:1,2,4,6,8,10,12,14,16,18,20,25,30,35,40,45 (total 16 diopters)