One tube, Large Adult Size, Blood Pressure Bladder for standard B/P units. (Meaning that the unit has a single tube that goes to a combination bulb and gauge unit as called a one-hander.)
If your blood pressure unit needs two tubes to function see the following selection of two tube replacement bladders
. The replacement units slide back through the slot in the cloth cuff.
11 - 3/4" long x 5 3/4" high (+/-)
These bladders have many more uses than just for checking blood pressures. Many hobbyists and inventors use these unit for different purposes.