Put the gears into the fixed axes by matching the outline printed on the base. The gears of same size are exchangeable to make different combinations. Base is 11 3/4" sq. 12 pc. Set. Ages 18 mos. +.
My three-year-old loves experimenting by swapping the same-size gears around the base. The wooden pieces feel sturdy and the matching outlines make setup easy for little hands.
My toddler figured out how to match the outline printed on the base surprisingly fast, and I love that the same-sized gears are interchangeable for different layouts. It’s sturdy enough to handle daily play without bending, exactly what we needed.