Sleds pulled by reindeer appeared later than dog sleds. They ensured their sled weights were the same as Peary's sleds throughout their journey. Activities include skiing, snowmobile tours and excursions with reindeer and dog sleds. The early sleds were adapted from boys' delivery sleds and toboggans. Early skis, or perhaps sleds, might have been reminiscent of shields. The wood can also be made into spears, bows, arrows, snowshoes, sleds, and other items. Guests rode on sleds mounted on teflon runners. Today some people use kites to tow exploration sleds. Traditionally, transportation was primarily by dog sleds (land) and kayaks (water). Carriages, coaches, sleds and sedan chairs are presented in an open building. Boeing built dressers, counters, and furniture, along with flat-bottom boats called Sea Sleds. Rocket engines are primarily used on rockets, rocket sleds and experimental aircraft. Only some of them had wheels; others were mounted on wheelless sleds. Racing sleds weigh for singles and for doubles. The original wooden sleds gave way to streamlined fiberglass and metal ones.