Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:Cube Root Bone Woods are 1/4" thick

Woods are 1/4" thick

depends on where you put the water tower piece

handmade from blue-stained maple hardwood with five different snowflakes laser-engraved into the lid and sides

Without turning the wheels

Compact and travel-ready at 6" x 6" x 1"

Napier's Bones | Handmade Wooden Math STEM Teaching Aid Add-ons:Cube Root Bone Woods are 1/4" thickNapier's Bones is a handcrafted wooden reproduction of the multiplication aid invented by John Napier in 1617. Before calculators, students and tradespeople used the marked rods to multiply, divide, and find roots. The base set ships with two complete sets of rods (0 9), a storage base, a wood cover, and printed instructions with worked examples. Optional square root or cube root bone add ons at checkout. Includes: storage base, 2 sets of rods 0 9,