The N Scale Curved Track Sections R15"-30 Degree (4 Pcs) by KATO Unitrack #20-140 are ready-to-go pre-built track pieces designed for model railroads. Made of plastic and nickel, these gray tracks are part of a two-rail system with an analog control system suitable for both boys and girls aged 14 and above. Manufactured in Japan, these tracks are perfect for creating intricate layouts and adding a realistic touch to N Scale model railroad setups.