The drum higher pitch basically the smaller diameter. Arthur-Hall model also have color depending on the size.
For many performers, tap the color timing, etc. Instructions and can be played by using the difference between the high and low pitch than musical. [Twenty-five Pack of content] -Drum of 25 (5 pieces Pack x 5) Sticks 15 pieces Mallet 10 Drum size: Blue = 15 cm, green = 21 cm, Orange =26.7cm =32.4cm yellow, red = 38 cm