Marklin 24230 - C-Track Curved Track R2 17-1/4
C Track Curved Track, Radius R2 = 437.5 mm / 17-1/4 inches
Every piece is 30°.
These are the standard length pieces for a R2 radius curve.
Charlie's Tip: If you need 1/2 the length, use a 24215.
If you need a tighter circle, or circle inside this one, use the R1: Marklin 24130 pieces. For a circle outside this one, use R3: Marklin 24330!
Also sold in box of 6 under Marklin 24230-1
Read Charlie's blog on C-track curves