Track, Curve 18" 1/8 Pair Features: Z-Bend Rail End ? Allows consistent electrical contact even when track pieces are not pushed together completely. Tapered Slot Ends ? Smooth, quiet performance as cars pass over track junctions. High Traction Surface ? Helps tires get maximum grip. Correct Cross Bracing and Supports ? Keeps track stable and junctions solid. Only with AFX track. Deepest Slot Depth ? Accepts longer AFX guide pin keeps cars on the track longer.