The MEGA BLOKS Big Building Bag Toy Block Set includes 80 blue blocks designed for children aged 1 and up. This interlocking block set is part of the Mega Bloks First Builders product line and is compatible with other PLUS PLUS and MEGA brands. The blocks encourage imaginative play and skill development in areas such as construction, architecture, and STEM. Perfect for young children, this set provides hours of creative fun and learning opportunities.