Description Made from recycled rubber, our Rubber Playground Timbers feature an interlocking and stackable design that conveniently contains mulch.  They are a safer, more attractive, and easier to use alternative to wood timbers. Let Happy Backyards create a Safe Play Zone for you and your family. Our Safe Play Zones provide superior impact attenuation while suppressing weeds, discouraging pests, and an attractive appearance year round. Our Safe Play Zones include a base of commercial grade geotextile fabric to inhibit weeds, Rubber Playground Timbers, Shredded Rubber Mulch, and professional installation.