Roller Design Digital Teaching Stamp, Math Stamps

1 Pcs Roller Design Digital Teaching Stamp: Math Stamps Practice Tools, Educational for Preschool All Arithmetic. Good Quality: photosensitive process, strong ABS plastic. Print thousands of impressions w/o losing quality. Interesting school supplies: fun and exciting. Refill packs w/ 1 free refills ink. Adjustable numbers 1-100. Mark clear, dry & does not fade. Addition/Subtraction/Multiplication/Division. Manual measurement, colors may differ.