Millie from Thomas and Friends Take-n-Play engine series. Made of durable die-cast metal with magnet connectors that connect either way. Perfect for Thomas & Friends Take-n-Play Portable Fold-Out Playsets. Measures: 2.75 inch long. Made by Fisher-Price who are well-known for quality control in product making. Confirms to the safety requirements of ASTM F963. Recommended for ages 3 and up.