Air conditioner seals should be replaced every time the air conditioner is removed, serviced, or repaired. We manufacture our seals from a single sheet of closed cell foam and die-cut them for a seamless product. Other A/C seals are made from foam strips and glued together at the corners where the seal will begin to break down and leak in time. Leisure Time Products' one piece seamless design makes for a longer lasting A/C seal. Each kit is supplied with 2 shroud support shims.