Our colorful keys are ideal for all kinds of early math activities…from counting and sequencing to sorting and patterning! Kids just slide the big, fun-to-use keys onto the chunky key rings—counting out numbers as they go—for super-involving, hands-on practice that makes concepts easy to grasp! Plus, the keys come in a variety of colors, sizes and styles, so kids can sort and pattern, too! Set includes 120 plastic keys, 20 key rings with built-in stoppers and a guide, all in a vinyl tote. Rings measure 3".