The Spinners expansion offers ultimate versatility! Use the wheels individually to let your marbles go for a spin, or combine them for some surprising effects…will the wheels spin to the right or left? It all depends on how fast the marbles roll!Details:4.8" x 11.2" x 2" (12.2cm x 28.4cm x 5cm) package sizeRequires Gecko Run Starter Set (sold separately)For ages 8 and upContents:2 extra tracks4 adapters1 sheet with nano-adhesive pads2 circle adaptersLarge wheelSmall wheel2 metal marbles