1. soft closing, can support 4kgs 2. ISO9001/14001, more than 80000 cycles 3. pass TUV test 4. stainless steel, high class 1.soft closing hinges for toilet seat cover 2.can use for more than 80,000 cycles. 3.support seat cover weight more than 4kgs4.TUV test passed, ISO9001/14001Basic PrinciplesThe cover falls from an upright position to a horizonal position, when it is in the highest position, ...