FB-START Pre-Cut Foam Beds (40+ meters)Many curve and straight beds are designed "double sized". For example, FB 608 9 comes as 10 pcs of "Double Size Third Radius Curve" bed which makes 20 pcs of "Standard Size Curve" beds. If you cut from the lines in the middle you get 20 pcs of Standard Size Third Radius Curve which is equal to Hornby R608. Thickness of the foam beds are 2 mm which is perfect for ballast laying and the edges are not beveled intentionally to prevent ballast slipping