Button football continued to grow in popularity, especially during the early 1950s. In that era, various materials were used for linesmen, some industrial, some hand-made. Industrial buttons could be ten-piece sets, uniform in size and color, or sold as individual pieces, varying in size according to function (larger ones for defenders, mid-sized ones for midfielders, smaller ones for attackers) and in several layered color combinations usually but not necessarily patterned after the more popular soccer teams; of the latter, the most prized ones were made of galalite, although several other plastic materials were also used such as the covers of discarded watches.