A brig is "generally built on a larger scale than a schooner, and may approach the magnitude of a full-sized, three-masted ship."[1] Brigs vary in length between 75 and 165 ft (23 and 50 m) with tonnages up to 480.[5] A notable exception being the famous designer Colin Mudie's 'Little Brigs'[6] (TS Bob Allen and TS Caroline Allen), which are only 10m long and weigh only 8 tonnes.[7] Historically, most brigs were made of wood, although some later brigs were built with hulls and masts of steel or iron.[5] A brig made of pine in the 19th century was designed to last for about twenty years (many lasted longer).[3][better source needed]