Improve parent-child relationship, Parents can read the knowledge about dinosaurs to children, and children can play the dinosaur cards with friends. It can stimulate babys language ability and imagination. Safe Material, BPA-free, non-toxic. the dinosaur cards are printed with non-toxic ink, covered with double-sided film, no sharp rough edges, glossy cardboard and rounded corner design is safe for your kids to grasp. It won't hurt children, and easy to clean. Package in transparent PP box, card dimensions:3.4 x 2.2 inches, portable for travel, indoor, outdoor, school. Best educational gift toys for birthday, Christmas, Holidays. If you are not satisfied for any reason, please contact us or return for a full and instant refund.