4-in Wooden Train Track Straight Curved Cross Adapter Connector 4-in Wooden Train Track Straight Curved Cross Adapter Connector Compatible with Thomas the Tank Engine, Brio, and other fine wooden trains and tracks. Made in the USA out of hard maple. Due to the natural variability of maple wood, the color and grain of an individual track piece may be different from what is pictured and may sometimes contain small imperfections that don't affect the functionality of the track piece. Loose/Bulk Packaging