Thames & Kosmos Color-Changing Crystals [並行輸入品]

商品説明

Grow phosphorescent crystals that glow in the dark! Experiment with growing crystals of different sizes. Learn about why crystals form, what crystal lattice structure is, and what makes these crystals glow.Recommended Ages:8 15 Dimensions:8.1in length x 2.2in width x 5.1in heightWeight:0.5lb.