1. soft closing, can support 4kgs 2. more than 80000 cycles 3. pass TUV test, ISO9001/14001 4. stainless steel, high class 1. soft closing, can support 4kgs2. more than 80000 cycles3. pass TUV test, ISO9001/140014. stainless steel, high classWe owe 15 yeas experiences in silicone oil rotary damper, and we always control the quality from the very original material.LF-33, ROTARY DAMPER, OPERATION ...