Crack open a colorful gem surprise! Little ones get a no-mess introduction to sorting, matching and counting with the play geodes and gems of Rock 'n' Gem Surprise. Using the included play hammer and chisel, kids crack open each reusable play geode to discover the translucent plastic gemstones inside, available in eight colors and four shapes. The gems double as manipulatives for sorting, matching and counting, while introducing kids to early STEM and geology concepts without the mess of real rocks. Each two-piece geode pops apart and snaps back together for endless fun. Size: 25.4 x 30.7 x 7.1 cm. For ages 4 to 5.