- Soft Bristle Bricks: Kikuo 150-piece color bricks have soft and interlocking bristles that stick at any angle for frustration-free building. The blocks are easy to handle for little fingers, adhere with minimal pressure, and securely lock in place. - High Quality Non-Toxic: The building blocks are made of non-toxic and elastic plastic material. Non-toxic, glue-free, BPA-free, odorless, and harmless to babies. Each product is always manufactured to the highest standards under rigorous safety regulations, ensuring the safety of school-age children. - Multifunctional Creative Toy: This hedgehog block toy can foster children's creativity and help develop children's spatial relationships, 3D spatial imagination, and hand-eye coordination. Children can acquire a strong sense of color, structures, geometric shapes including 3D shapes, number counting, and architectural design at an early age. - Happy Learning & Puzzle: Encourages creativity for STEM education (science, technology, engineering, art, and mathematics) which is the key factor for success in the constantly changing environment. It allows children to improve hand-eye coordination, gain a strong sense of color, count, sort, pay attention, promote the child's brain development, and focus. - Easy to Clean and Store: These interlocking bristle blocks come with a large barrel for all the toys in it, helping your children develop the habit of actively organizing their toys, and making it convenient to take along on playdates or trips. Clean with warm water and soap and let air dry.