The Stair Bump Aid Kit consists of both the Upper and the Lower Stair Bump Aid devices. We have found that those who order these products buy them in pairs as a complete kit. We have therefore priced them in kit form to save our customers on both price and shipping. This kit is designed for people who for one reason or another have to go up and down stairs on their bottoms by scooting from one step to the next. The purpose of these devices it to make standing up much easier, both at the landing at the top of the stairs as well as at the bottom of the stairs. These devices also make it easier for the patient to sit on the devices to begin their going up or down the staircase. Both units easily fold flat against the wall so others can go up and down the stairs without obstructions. Both units will hold 250 lbs. Order yours today, to make it easier for you to go up and down the stairs.