Roylco's light learning rocks collection features eight different nature-inspired shapes across six colors, produced in a durable, transparent plastic to promote color learning and 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. Details: Assorted translucent shapes and colors 9.5" x 6.25" packaging size 2" x 2" maximum rock size 67 pieces Promotes light and color learning Plastic Compliant with domestic and international toy safety regulation Suitable for ages 3 and up Contents: 48 light learning rocks 18 easy, medium and difficult combination cards 1 storage box