All genuine Dankung slingshots are made of high quality stainless steel or titanium, aluminum alloy. But there are some zinc & poor quality steel (say, the recycled steel, only one-tenth cost of DANKUNG's food grade 304 stainless steel) Dankung counterfeits circulating in the markets, especially some Internet stores. Zinc is much cheaper than steel and is very fragile. Zinc slingshot is often insane low price and falsely indicated as steel by sellers. For your safety of eyes, never use the zinc & poor quality steel dankung counterfeit slingshots.
A low-quality slingshot might break within just a few days of purchase or after two years of use. However, lasting two years doesn’t mean the user is "lucky"—it simply means the slingshot held out until it suddenly failed.
Zinc slingshots could break within a month, and poor quality steel often breaks in one or two years. In either case, the breakage can occur without warning, whether you’re pulling the band or your child is. This poses a serious risk of injury, especially to the eyes and hands.
Shooting darts with zinc slingshot just doubles the danger and damage.
They may look 'professional' and 'powerful'. For a zinc alloy fishing slingshot, being 'powerful' only means bigger risk of break and snap. 
DANKUNG High Quality Slingshot Fishing
Recent zinc alloy slingshot breaks( Sep. 20, 2018)
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