These playful rollers will delight children as they sing along to the rhymes they create, while at the same time developing important early language and fine motor skills. The six much-loved rhymes include: Twinkle, Twinkle Little Star, Hickory Dickory Dock, Humpty Dumpty, Itsy Bitsy Spider, Five Little Speckled Frogs, and The Wheels on the Bus. Set contains six rollers measuring approx. 2-3/4" x 1-3/8". Safe for 2+.