The gravity hammer gives the marble new momentum – even enough to move it up several levels again. After the gravity hammer is installed, the part with the metal ball must be rotated upward. When an approaching marble subsequently bumps against the gravity hammer, the metal ball swooshes down and knocks the marble forward with momentum. Our modular and compatible marble runs are designed to stay put, so your kids can focus on the fun. They promote spatial intelligence and an understanding of fundamental physical concepts like acceleration and gravity. Wether with an instruction booklet or with free play, constructing a marble run stimulates working memory, and improves the capacity for analytical thought. And best of all, we’re building on an existing system to extend its life in the childrens room. All 6 parts and components of the Gravity Hammer Accessory are compatible with common components from other manufacturers and can therefore be creatively combined with your existing building blocks and theme worlds. Like all products from Hubelino, the Gravity Hammer Accessory is manufactured in Germany under the highest quality standards.