CHARACTERISTIC: Compatible with all major building block sets and classic size building bricks. CREATIVITY FUN: Birthday or Christmas gift for develop children's creativity and imagination. Build anything you can dream of. MATERIAL: Made with premium, high quality material that have been tested to comply with all u.s. toy safety standards and are free of lead, cadmium, and phthalates. 1000PCS Bulk Building Blocks for Kids 6 Years and up. Brand: XDR