Using these school chairs is a piece of cake. Just place them where you need seating, and they're ready to use. Since no assembly is required, you can start using them right away. When it comes to mobility, you can easily pick them up and move them around thanks to their lightweight design. To stack them, simply lift one chair and place it on top of another. You can stack up to 10 chairs for efficient storage. For maintenance, use a mild soap and water solution to clean the blue polypropylene plastic shell. Avoid using abrasive cleaners as they might damage the surface. As for safety, keep in mind that these chairs are recommended for 3rd - 7th grade students. Don't exceed the static load capacity of 309 lbs to ensure the chairs' durability. And remember, the item description might mention features of other product variants, so check carefully if you're looking for specific details.