Using these chairs is super easy. Just place them wherever you need them - in a preschool classroom or a kid's bedroom. Since they're pre - assembled, you can start using them right away. When it comes to stacking, you can stack up to 10 chairs together, which is great for saving space when not in use. As for the weight capacity, make sure not to put more than 154 lbs on a single chair to keep it in good shape. To keep the chairs clean, simply wipe them down with a damp cloth. Avoid using harsh chemicals as they might damage the polypropylene shell. These chairs are designed for preschool - aged kids, so make sure to use them within that age range to ensure the best experience.