Office Master Discovery Back Chairs and Stools. DB52, DB53, DB56, DB57, DB64, DB68, DB74, DB78, DB92, DB96 The Discovery back chair was designed to specifically address users seeking to promote a healthier seating posture. The unique"Pear-Shaped" design of the backrest permits a seated user's shoulder blades to travel more fully rearward when leaning back. Order your Office Master Discovery Back today and save!