Our wooden rock wall has strong durable pre-cast plastic rock hand and foot holds. ,* - ASTM F1148-05 - Standard Consumer Safety Performance Specification For Home Playground Equipment. All of our premium playsets meet or exceed the standard established by ASTM International. ASTM International sets voluntary safety standards for home playground equipment. While these standards are voluntary, you can be sure that play structures that are compliant are the safest on the market.