Durable, flexible set of interlocking plastic building blocks Encourage tactile exploration, creative building activities, and patterning Set includes 220 pieces in a variety of sizes and colors as well as activity cards Largest piece measures 5.28"L x 1.89"W, smallest piece measures 1.42"L x .55"W For ages 18 months and up 18 months & up. Encourage creative play, tactile exploration, and open-ended building using the Snap and Stack Thistle Block set. Children can easily fit the durable plastic bristles together to create satisfying connections and construct anything their imagination can inspire. A variety of pieces will help children develop color and shape recognition as well as size relationships and pattern building. This 220-piece set allows for large builds independently or collaboratively.