Octo-bans
Octo-bans, also known as tube toms, are deep, small diameter, single-head tom-toms. Octo-bans were originally grouped in melodically-tuned sets of eight, hence the name, in reference to octave and from octo meaning "eight". Part sets of two or four drums or an individual drum or octo are common additions to a drum kit. Complete and half sets of Octo-bans are commonly mounted in clusters of four, in a square pattern. Mounts for four drums in a straight line, dual mounts for two drums, and individual mounts are all also reasonably common.
History
Octo-bans were introduced by Tama Drums in 1978, and endorsed by Billy Cobham, at that time one of the most popular drummers who had switched to Tama drums. Tama Octo-bans were made with fiberglass using a patented molding process. The naked shells were then painted in black lacquer (the raw color is something close to light brown, visible inside the shell where not completely painted). Since they were designed as rack toms the attachment was different from the regular tom-toms, it was basically the same one used for the concert tom-toms.
Size
The 6" diameter shells can be tuned melodically and are available in low-and high-pitch sets.
High-pitch set
280mm (11") depth
301mm (11 3/4") depth
343mm (13 1/2") depth
390mm (15 1/2") depth
Low-pitch set
443mm (17 1/2") depth
472mm (18 1/2") depth
536mm (21") depth
600mm (23 1/2") depth