Roylco's Light Learning Rocks collection features 8 different nature-inspired shapes across 6 colors, produced in a durable, transparent plastic to promote color learning & sensory exploration in a beautiful way. These gems have also been designed to function as tools for mindfulness and concentration building as their smooth curved edges and weight can create a calming effect. As an added bonus, the set of 48 rocks includes a card deck of 36 pictures and patterns, sequences and stacking challenges that range in difficulty. Standalone or with a light table, these rocks bring magic into the classroom or home. This product promotes: Color & light learning, STEM logic skills, Fine motor skills, Mindfulness, and Basic sequencing. This set features: 48 light learning rocks (8 different shapes in 6 different colors up to 2 x 2" (5 x 5 cm)), 18 easy, medium, and difficult combination cards, and a storage box. For ages 4+.