Non-metal building materials in the nature of concrete accessories, namely, plastic chairs to position and hold rebar or mesh reinforcement in place during concrete pour; plastic slab bolsters to snap chairs together providing for long runs for reinforcement of rebar or mesh; plastic wheel spacers to hold rebar and mesh reinforcements; plastic clips which clip on the spacers to hold rebar or mesh reinforcement; plastic panel pads used to protect concrete units from cracking and chipping during storage when stacked; plastic chain guards placed on concrete units to prevent chains or straps from making contact directly with concrete thus causing damage; plastic shims used for leveling concrete units during erection; plastic panel ties to anchor insulating foam in concrete wall panels; plastic coil loop insert protectors to provide complete protection to the helix of a coil loop insert during concrete pouring and finishing; plastic prestress sheathing designed to debond prestress strand; and plastic concrete formers to provide smooth chamfer or radius to the edges of concrete