The Big4Two is vacuum formed from a solid acrylic sheet. Under the shell is a stainless steel frame reinforced with multiple fiberglass mesh and gelcoat layers. The tub's main feature is two center-facing seats. The U-Shape outward swing door is made from durable plastic composite with a tempered glass front screen, and uses a gear/shaft driven, 3-latch door lock system to create a secure door seal. The Big4Two also comes with the fastest gravity driven drain in the industry, the Ella Dual Drain Technology. It consists of 2- 2" gravity driven drains with 4- 2" outlets, 2 overflows and 2 openers.The Hydro Massage System includes: 2 hydro pumps with an in-line water heater, ozone sterilization system, intensity dial control, and hydro jets. The tub has 24 hydro jets: 16 upper jets (8 per seat) for your back, hips/thighs, and 8 lower jets for your feet and calves. With the Hydro + Independent Foot Massage package, bathers can enjoy an independent foot massage within minutes of filling the foot-well.The Air Jet Massage System delivers a more gentle massage and includes: an air pump with a 3-speed variable, air jets, and an auto-purge maintenance system. The tub has 22 air jets: 18 upper jets (9 per seat) for your back, hips/thighs, and 8 floor jets for your feet/legs. Also, Chromatherapy will dazzle your tub with multicolor LED lights. Stream one color, or allow the lights to cycle through 8 colors. The digital control keypad for LED light, air and hydro massages is included. Color: White.