Constructed of pressure treated timber, this swing set is built to last. The 90mm top beam and 70mm legs provide maximum strength, ensuring your children stay safe at all times. For stability, play equipment must be anchored; various options are available depending on the ground type. Searching Rebo anchors on the store will show you the options. Please note: This item is constructed of natural wood and it may split or crack. This does not affect the structure or strength of the item. For stability, play equipment must be anchored.