The ideal hobby whether this is your first 3D puzzle or you are looking to expand your existing craft collection, you've come to the right place. Building this is half the fun, then you can play with it. This wooden COG coaster will keep you busy as you put pieces together to make it. Wooden puzzle kit this DIY COG coaster kit will help you recreate a roller coaster for the steel balls. It's a masterpiece that you can be proud of. After the assembly, turn the hand-crank wind-up and watch the steel balls roll around the assembled build. Educational materials if you or your child is interested in engineering and trains, they'll love this astonishing wooden cog coaster puzzle that helps promote reasoning, logic, imagination and other key factors that affect the mind. Children will love this hands-on, imaginative introduction to the world of roller coasters. Quality plywood our punch-out sheets are high-quality and fun to assemble. The fact that our assembly supplies are made of non-toxic plywood that is safe for the environment is an added bonus. A great gift finding a good gift can be hard, especially if you're looking for one that is unique while stimulating. Our 3D cog coaster kit is great and recommended for ages 14 plus. It is unique, challenging and fun.