Advantages: 1. The mechanism works very well and you can adjust the tension2. It keeps your key in place and easily pulls out when needed. Cons: 1. The black surface is very easy to scratch and I tried to be very careful but I scratched it even after using a paper towel to insulate the coin I was using. 2. The ring on the other end is a joke as it's too small and can go through anything. You have to buy another ring for this, which is completely unnecessary for a minimalist design.
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