You don't need a lot of space to provide a lot of backyard fun for your kids. All you need is a basic swing set. If your goal in keeping to the basics is to save money, you'll need to make sure that you're purchasing a high-quality swing set that won't fail or become damaged in a few years.
When you're comparing the various models in the marketplace, take into consideration the following aspects: the diameter of poles, the design's stability, and the weather protection of the materials used in its construction.
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If you want a top-quality swing set, search for comfy belt swings. You could also get the fun trapeze bar which has triangular grips that make it easy for hanging. A quality heavy-duty set should be able to support the weight of 400 lbs, or the equivalent of three 12-year-olds who weigh 135 pounds. You should look for a wider-angled A-frame, which can provide more stability to freestanding models, without the need for a cement-based installation.
Make sure that the poles are constructed of high-quality steel that is at minimum 3 inches in diameter about 230% more durable than two-inch diameter poles in the cheaply-made swing sets available. It is recommended to purchase a frame made of steel that has been coated in powder to stop rust and cracking. Ensure that all parts made of plastic have been UV protected to avoid discoloration and retain heat.