Johnsonite Rubber Stair Treads are manufactured from a homogeneous composition of 100% synthetic rubber, high quality additives, and colorants to meet the strict performance requirements. Johnsonite Raised Round Surface Rubber Stair Treads is their most popular tread, leading the way in contemporary design, with optional grit or rubber friction strip. Optional Grit or Co-extruded Friction Strip Can easily be cut to exact size using a utility knife and straight edgeAbrasive strip near the edge of the tread embedded into the tread's surface that provides traction, awareness, and safety from slipping. Co-extruded rubber/vinyl strip in a contrasting color inserted near the edge of the tread, designed for safety and awareness.