This heavy duty model is designed to operate with a four-stroke engine, which can often weigh 40% more than their two stroke predecessors. With a 17’7” chamber diameter and with the help of the solid wood floor and the inflatable keel, the JS440HDW has a smooth and stable ride. Spacious enough to comfortably ride up to 8 people. Designed for scuba divers, rescue teams or for any group boating occasion.