with 100 balls
red / blue
Frame parts and balls (Ø 1.3 cm) made of RE-Wood®. All parts are screwed together.
Very sturdy design with stainless steel rods. (25 x 17 x 4.5 cm)
Packed in a cardboard box.
All sorts of things can be done with the red and white balls arranged in steps of 5: Numbers can be represented or simply counted, "greater than, equal to or less than" comparisons, all basic arithmetic operations , tens transitions, taking square and cube roots and much more.