Material: stainless steel or GTC4 titanium alloy processing, solid and reliable, never rust. Process: precision wire cutting Stainless steel net weight: 6g (including stainless steel screwdriver + key ring + self-sealing bag) Titanium alloy net weight: 5 g (including titanium alloy screwdriver + key ring + self-sealing bag) Features: the smallest mini bottle opener in China. It can also be used temporarily as a word screwdriver. Man EDC must be one of the artifact, gift friends and relatives is a good choice.