This K'NEX Standard Parts Lot includes 50 (+1 just in case) light gray rods that are 7-1/2" long and made of plastic. The rods are compatible with other K'NEX building sets and come in a polybag packaging. The bulk lot of rods is perfect for children 7 years and older who love to build and create. With endless possibilities, these rods can be used to construct anything from towering structures to intricate machines. Let your imagination run wild with this K'NEX Standard Parts Lot.