The main purpose of STS-105 was the rotation of the International Space Station crew and the delivery of supplies utilizing the Italian-built Multi Purpose Logistics Module (MPLM) Leonardo on its second flight (STS-102, STS-105). The crew also performed two spacewalks and conducted scientific experiments. The Multi Purpose Logistics Module (MLPM) taken on STS-105 contained additional scientific racks, equipment and supplies. It is long and in diameter, made from stainless steel, and has a dry mass of over . An identical module named Raffaello has flown twice (STS-100 and, later, STS-108).