The most popular scales, by far, are 1:35 and . Other less-commonly used scales for commercially produced kits include: , , 1:9 ("Traditional" scale), , 1:16 (RC tanks, scale model kits), , , 1:30, , , , , 1:87 (railroad HO scale), , , , , and . A relatively recent trend led by Tamiya is military vehicle kits in 1:48 scale – a popular scale for military aircraft models. The scale was formerly introduced by companies such as Aurora, and Bandai in the 1970s. However, the scale did not gain popularity mostly because of the accuracy and detail of the scale. Scratchbuilt models may be in any scale but tend to follow the most popular kit scales due to the ease of finding kit components which may be used in the scratchbuilt model.