This set of 3 contains three large cylinders with fat spherical colorful droplets that roll in a line down a spiral staircase. Our highly attractive crystal clear sensory liquid set contain colorful oil and water in a range of designs. The set will captivate and fascinate kids and are an ideal resource for quiet focus, as well as inspiring curiosity, developing creative language and understanding simple scientific principles. When turned upside down they provide a variety of ways for the droplets to fall or rise. Size: 5.90" x 2" .