This is a fun water play activity that can provide calming to young children. Each frog mold can be sorted and played with a variety of ways. Children can practice counting with these frogs that also help with color recognition, eye-hand coordination, sequencing and spatial relationships. They come in three different colors: red, green and purple in three different sizes that connect together. Fill them up with sand while you're at the beach on vacation or with water during the summer by the pool. These frogs are great to take along on travel and to use in the classroom. They are durable and will last a long time. Each set is made of mold-resistant plastic and includes a reusable mesh bag. The frogs measure 2.75" x 3.75".