M9 Spindle box modification
Concept same as spindle box, however, I have used same color straws for numbers adding up to 10, i.e. 4 different colors set of 10 straws & 1 more color set of 5 straws.
Concept of 0 & base ten math system
Buy / DIY Material(s)
Glue toilet rolls to cardboard using heat gun. Cut straws to size.