The black liner is a replacement part for Coleman Miami AirJet Hot Tubs. This liner is compatible with your AirJet hot tub, with 120 jets around the bottom of the tub that will surround you with a relaxing bubble massage. The sturdy DuraPlus liner is made out of an ultra-durable, 3-layer material that is reinforced for strength and puncture resistance. Simply attach your filter pump, inflate the liner and enjoy a relaxing soak.