Each section combines track and roadbed into a single unit, with snap-fit assembly and plug-in wiring to provide instant railroad fun. A hidden locking feature holds sections securely together until youre ready to take them apart. Easy to set up on any surface, including floors and rugs: no special tools, nails or boards are needed. A great system for Christmas, displays or permanent layouts. Twelve sections of curved 18′ radius track make a full circle 16 sections of curved 22′ radius track make a full circle.WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov