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Rock crayons are colourful rock-shaped crayons that you can use to create your colouring activity masterpieces. These Rock crayons from Kid made Modern are non-toxic crayons made from kosher soy rocks and natural pigments moulded in the shape of rocks. These rocks are appropriately sized for young children's small hands and are very easy to carry around as a portable colouring instrument for your child's colouring activities. By using these rock crayons, your young child's fine motor muscles in the hands for holding, grasping, gripping and manipulation to colour their artwork activities will be strengthened and developed. Because of their shape, rock crayons are ideal colouring tools to teach and train young children about the proper fingers placement in holding the pencil by reinforcing the use of the thumb together with the first and second finger grip, therefore, to train these 3 fingers the proper way to hold a pencil later in their lives. Suitable for ages 3 and up.