The black liner is a replacement part for Hydro-Force Havana 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.