Kotap 4-ft x 150-ft Fire Retardant Vertical Safety Netting, Royal Blue, Item: SNB-4150FR Roll Size: 4-Feet by 150-Feet Knitted Polyethylene threads (3. 5 oz. per square yard) Meets requirements of NFPA 701 Test Method 1-2010 Edition Hole openings approximately 1/4-inch by 1/4-inch Meets NYC Local Law 61 and OSHA specs