The drum set of the late 1930s was generally devoid of many of the traps of earlier sets, reflecting instead the period. All set included the typical bass drum, but the Chinese tom-toms had begun to be replaced by single- and later double-tensioned tom-toms produced by the drum companies. Ride cymbals were expanded to 18 to 22 inches in diameter and reached sizes as large as 25 to 26 inches during the 1940s and 1950s. Chinese cymbals were included in many set. The crash cymbal came into vogue as the ride cymbal became a single-function instrument, with the crash cymbals ranging from 12 to 16 inches in diameter and the hi-hat generally from 12 to 15 inches in diameter. The snare drum had become the trademark of many players and companies, utilizing the latest in feature, such as separate tensioning of the heads, a variety of snare adjustment mechanisms, and a wide choice of shell materials and designs.