Which top spins the fastest? Which top spins the longest? Which top doesn’t spin at all? Use YOX links to design the ultimate top or build two tops that compete, where the last one to fall over wins. Bonus Points: YOX tops are a fun way to flex creative thinking and problem-solving skills while learning about physics! ABOUT YOX Made in the USA! YOX® are big, bold, and nearly indestructible links shaped like a Y, an O, and an X. YOX click together with each other and with fun stuff you already have around the house, including TP tubes, paper towel rolls, cardboard boxes, and anything else kids can get their hands on. The goal of YOX is to spark creativity in kids (and grownups!), giving kids tools to be inventors and let their innate creativity run wild. Think less instruction, more imagination. YOX links come in three fluorescent colors and are crafted from high-quality ABS plastic. The links are safe and durable, designed to last for years and inspire generations of young inventors.