The Orion crew module (CM) is a reusable transportation capsule that provides a habitat for the crew, provides storage for consumables and research instruments, and contains the docking port for crew transfers. The crew module is the only part of the spacecraft that returns to Earth after each mission and is a 57. 5° truncated cone shape with a blunt spherical aft end, 5. 02 meters (16 ft 6 in) in diameter and 3. 3 meters (10 ft 10 in) in length, with a mass of about 8. 5 metric tons (19,000 lb). It was manufactured by the Lockheed Martin Corporation. It will have 50% more volume than the Apollo capsule and will carry four to six astronauts. After extensive study, NASA has selected the Avcoat ablator system for the Orion crew module. Avcoat, which is composed of silica fibers with a resin in a honeycomb made of fiberglass and phenolic resin, was formerly used on the Apollo missions and on the Space Shuttle orbiter for early flights.