Octoban

Octobans were originally grouped in melodically-tuned sets of eight, hence the name, in reference to octave and from octo meaning "eight".

Complete and half sets of octobans are commonly mounted in clusters of four, in a square pattern.

The rims were shaped to expose the maximum possible head area to the stick, since a 6" diameter is not easy to hit reliably.

The lug design has been modified from the original, and though the batter skin is still clear it no longer has the black dot.

[1] The term octoban has since become a generic trademark used to refer to such sets of narrow-diameter tube drums.