Watch How to use the BT Double Air Wedge. The BT Double Air Wedge comes in two different styles; the yellow Air Wedge has more of a grip with a rubbery material, while the black Air Wedge has a slick smooth feel to it with a strong nylon surface. Our double Air Wedges are the same size as our single Air Wedge. The Double Air Wedge is all connected into one big unit. Using the BT Double Air Wedge is very useful on car doors when trying to open a door evenly.