EXAM STOOLS. WE DO NOT STOCK THE MODEL 193 OR 194 SERIES. THESE TWO TYPES ARE BY SPECIAL ORDER ONLY. PLEASE ALLOW 2-3 WEEKS DELIVERY. (PRE-PAYMENT REQUIRED FOR ALL SPECIAL ORDERS) MODEL 196 IS AVAILABLE, COLORS VARY. IF WE DO NOT STOCK THE COLOR YOU DESIRE, IT CAN ALSO BE SPECIAL ORDERED. THE 193 SERIES IS A SWIVEL TYPE (SPIN SEAT TO RAISE) MODEL 194 IS ALSO A SWIVEL TYPE WITH BACK OUR MODEL 196 IS A PNEUMATIC WITH BACK (HANDLE ON SIDE TO AUTOMATICALLY RAISE OR LOWER SEAT HEIGHT) 5 BASE CASTER BOTTOM (BLACK) THESE STOOLS ARE ENGINEERED TO OUTLAST ALL OTHER MODELS. (REMEMBER YOU GET WHAT YOU PAY FOR)