Straight tweezers SS1 is Stainless steel type of material and tweezers legs have 7 holes. So the Straight tweezers SS1 weight is 15.16 gram. That's why this eyelash extension tweezers are more light weight than other three of tweezers (Straight Tweezers S1, Straight Tweezers PS1, Straight Tweezers S2). When you grab this tweezers, you will feel very soft tension of the tweezers leg pressure. If you looking for soft tension of the tweezers and you try this eyelash tweezers, your have the best choice!