Plastic model kit of the Soviet JS-5 Heavy Tank, IS Tanks were a series of heavy tanks developed as a successor to the KV-series by the Soviet Union during World War II. Designed as a breakthrough tank, became the basis for the T-10 tank. Kit consist of over 530 parts w/refined detail, 23 sprues, multi-slide molded lower hull and upper hull, copper cable, photoetch, 180 individual tracks links.