Rotodrums also known as rototoms have a variable defined pitch.
They are tuned by simply rotating the head and hence composers often write for them as tuned instruments. They are often combined with a standard drum kit to increase the range of the toms.
This set from Percussion Plus includes two drums, 12” and 14”, along with a rail and stand. The robust stand is height adjustable and double braced with rubber feet making it sturdy and reliable.