... Plug For Iphone are made of Crystal,metal,Plastic,free of lead and nickel ,Environment-friendly. They are compatible with cell phones with 3.5mm earphone jack ... plug for iphone Material Crystal,Metal,Plastic, free of lead and nickelColorBlueWeightApprox 9gCompatipility Compatible with cell phones with 3.5mm earphone jack FunctionIt can prevent your earphone plug ...