These can be used with original coils or aftermarket. Designed, developed and tested in Australia by Dobinsons Spring & Suspension, in-house suspension design engineers, Dobinsons 4×4 shock absorbers and coil springs are designed and tested to perform in the harshest conditions right across the world. We export to over 40 countries worldwide from our Australian head office. The importance of quality is at the forefront in the complete design and manufacturing process. This ensures every shock and coil spring can withstand the blistering heat and corrugations of the Australian outback right through to the subzero temperatures of a Russian winter. Our Twin Tube Nitrogen Gas charged shock absorbers are made from the world€™s highest quality external and internal parts sourced worldwide. They provide a significant increase in performance over the standard shock absorbers. Twin tube shock absorbers feature larger bodies, larger bores and increased valving performance to dramatically improve vehicle handling and control and reduces shock fade.