Funtimbers™ have rounded corners and no sharp edges, making them safe for any play area, and unlike treated wood timbers, Funtimbers™ will never rot, decay, splinter, or secrete poisonous arsenic like treated wood timbers. They are the most cost-effective, easy-to-install retaining system in the playground industry. Funtimbers™ are constructed of polyethylene and are extremely durable, yet lightweight, and require far less labor than the conventional wood timber. Once installed, Funtimbers™ are virtually maintenance-free. Our 4ft length is easier to work with than 6ft timbers, allows for unlimited varieties of design, and requires only one spike for secure installation. Our snap-in spike containment enables the Funtimbers™ and spikes to ship as one unit, which saves you time and money on installation and prevents loss in shipment. 4ft4inL x 12inH x 4inW each. Weight: 12 lbSand and Waterith spike *Additional freight charges apply. Please phone or email us to speak with a playground specialist to answer any questions you may have regarding our playground equipment. We would be glad to assist you.