As we needed another swing  had maxed out available anchors on play set, we opted to purchase this swing  hang from a large tree.  The swing diameter is 40”, easily accommodates 3-4 kids or 1 adult  1-2 kids.  Depending on how you anchor, the swing can spin or swing.  We anchored swing to tree branch using a cam buckle tie down strap (strap supports 1,000 lbs AND swing supports 600 lbs).  Most importantly is that everyone loves it and HAS FUN on it!  Very happy with purchase.