Different or the same? - a set to compare sounds

MACHINE TRANSLATION (not authorised yet)

The set includes 6 pairs of triangular prism-wood blocks, each 6 x 5 cm. Each block and its pair produces a musical note after shaking. Each pair producing the same sound is marked with a different color of the note, but only on one wall, so that you can reverse the block and increase the difficulty when comparing sounds.