Set of 20 transparent sorting domes in 4 different colors, numbered 1 to 20. Have the children hide objects under the domes and lift them up to check if the number of objects matches the number on the dome. You can also use them for other mathematical tasks, for example practicing the number sequence, rank, even-odd, etc. These sorting domes are also ideal in combination with a light panel. 

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set of 20 transparent sorting domes (1-20) (dim. diameter 10 cm)