ERGOS EDGE tops use Polypropylene (PP) on the edges. Superior impact resistance when compared to rigid wooden or PVC edges. No glues or varnishes are used (no toxic products). The injection molded polypropylene is placed on the top with a mold through high pressure injection, 800 Ton. ERGOS EDGE edges reduce damage to walls and other furniture when moving tables. Options: pen holder, cup holder and leaf stop. ERGOS EDGE tops are adaptable to various types of metal structures.