My son has several kits and accessories so we were pleasantly surprised to see that they have come out with something he doesn't already have! In fact, you get two in each box, and they pair perfectly with Marble's other ingenious pieces. I was worried the sound would be a bit awkward, but to be honest it's a short sweet sound that's not too long or loud. I would buy others but they are currently sold out so I will keep an eye on them. The only thing I'm not sure about is the battery life, but if it's running low fast I'll update
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