... duration UL and NSF61 prompt delivery Rubber Speed Hump,Safe Road Material:NR high and low temperature resistance, anti-aging,wear ... :Rubber seep hump2. Material:NR,SBR,SIL,NBR,etc3. Application: road, parking-lot, quay,Safety brake equipment and more4. Performance:high ... , %60%82.9%2) Retention of Elongation, %60%95% Rubber road cone