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These abaci are intended for 1:12 action figure accessories, but nevertheless look good on their own.
Measuring roughly 2 x 9 x 24 mm, these are currently the smallest fully functional abaci available on shapeways.
This product includes:
Two Japanese Abacus / Soroban connected by sprues
P.S. please turn on "print anyways" if you purchase this product, as shapeways warned me for loose shell (which theoretically already surpassed the material minimum).