Products Are Made By High Materials,These Shocks Are Suitable For Heavy. Brand new a pair air shock absorbers is good for replacement. Good replacement and easy installation. The point of performance and price comfortable,stable,high quality,high-performance motorcycle parts. Please check the size measurement chart carefully to ensure it’s the right item you need before mapayment. Color:Round Hole pitch:320 mm Eye diameter:10mm Spring diameter:About 6cm Applicable models:Universal for most of models with 320mm mouting hole pitch Function:2 gas cylinders design,built-in nitrogen balloon,inflatable,shock and harden the hardness depends on the air inside the ball is full. NOTE: No instruction included,professional installation recommended. If you have any problems with our items or services,please contact to us first?? This type of motorcycle shock absorber is designed to reduce the vibration caused by rough roads.