This 350ml building block mug is made from BPA-free, food-grade plastic, ensuring its safe for enjoying their favorite beverages. What makes it truly unique? The Lego-standard block interfaces on both the cup body and handle, allowing them to build and design right on their mug.Perfect for the imaginative friend, Lego enthusiast, or anyone who loves a playful twist on everyday items, this gift promises both fun and practicality in every sip.