WISSNER active learning Jumbo Arithemtic String, 20 RE Wood Balls Red/Blue

Demonstration chain of 20 numbers: 20 red/ blue balls (diameter 25 mm) made of RE-Wood, in the 5th step on a 100 cm long string. playfully promote numerical comprehension and facilitate access to the numerical range up to 20 and to abstract mental arithmetic packed in polybag made of RE-Wood: 100% recyclable, certified with the PEFC seal and free of harmful substances; complies with toy standard DIN EN71-3 Made in Germany