We've had a run on these lately, actually, and the 1904B—the eight-key version—is pretty much what most distributors are asking for, since it hits that sweet spot for early learning without being too complicated.
The hidden hammer is what it does, basically, it tucks away into the frame so you don't have a loose part to track down, and the metal bars are tuned to a proper C-scale so the notes actually sound decent—better than some of the cheaper plastic-key alternatives we've seen.
CE, ASTM, and RoHS all check out on the COA, so you're covered for EU and US markets, though I'd mention the MOQ is 48 pieces per color box, and the carton dimnesions run about 62 by 26.5 by 39 centimeters if you're figuring out shipping.
Most buyers go with multicolor option (usually 2-4 weeks lead time) for that visual appeal with toddlers, but honestly, it's not ideal for kids much older than seven—the range is limited enough that a six-year-old might find it a bit basic after a few sessions.
We usually have stock, but confirm lead time if you need more than 200 units or so, and the net weight per carton is roughly 11.65 kilos, so it's manageable for standerd courier services without hitting overweight surcharges.
One thing that doesn't always come up in the spec sheet is the bar spacing—we've had returns form buyers who didn't realize the gaps are tight enough that a 7-inch crayon won't jam between them, which is pretty handy for classroom use.
We require a minimum order of 48 pieces for this model.
It has CE, ASTM, and RoHS certifications, so it's safe for kids 18 months and up.
Each unit comes in a color box, with dimensions 24.8×3.5×11.8 cm.
The body is plastic, and the 8 keys are metal, with a hidden hammer inside.
Net weight is 11.65 kg, and gross weight is 12.35 kg per carton.