Quality Montessori Materials for Toddler, Primary and Elementary Since 1993. E&O Montessori USA.
US contacts:(905) 313-0530, Fax: (905) 313-0402 firstname.lastname@example.org
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The number cards are made of durable plastic, not paper. Included is a beech wood box.
The smallest number card measures: 1.77 x 2.2 inches (4.5 x 5.5cm).