... Used for the Overheadcrane,Gantry Crane Introduction:JHQ-A Polyurethane Buffer for Crane1.Light weight, cheap, easy to ... Using description: this buffer its variable body is with polyurethane material after appropriate formula processing made of, weight light, ... -20 ¡æ ~60 ¡æ. 3.Works: polyurethane buffers are micro-holes using special polyurethane material, foam structure of energy-absorbing buffer, ...