Four, clear plastic tubes holding differently weighted and colored objects. Hold, tilt, flip, shake or even roll the tubes, to see, hear and feel the differences between them. A fantastic addition to your sensory play area for little learners to experience new sounds and sensations. The colored beads, plastic gemstones, smiley and colored bumpy balls are permanently enclosed in the sealed tubes. 16" L. x 2" diam. Set of 4. Ages 18 mos. +.