LEGO 4520 Curved Rails This is a set of curved rails released in 1991. Product Number: 4520 Japanese Name: Kyokusen Rail (Curved Rails) English Name: Curved Rails Release Year: 1991 Number of Pieces: 8 Number of Minifigures: 0 Age Recommendation: 6+ This is a set of two. The box has wrinkles, scratches, and slight dents. Please refrain from purchasing if you are looking for a perfect product, as it has been stored by a regular person. Thank you for viewing.