JZP-4.5B Rubber Shock Absorber - Color-Coded Durometer Poka-Yoke Assembly Mount The JZP-4.5B belongs to the JZP-B series of assembled vibration isolators produced by Xi'an Hoan Microwave Co., Ltd. Each mount combines a precision alloy steel spring with a vulcanized rubber cushion. The spring carries the static load and recovers after impact, while the rubber element converts vibration energy into heat that is dissipated through the mount body. This structure controls