1.Q: Are you Factory ? A: We are factory, professional manufacture of heating elements, extension cord, water heater,electric stove more than 20 years. 2.Q: Which Certificates do you have? A: We have CE, ROHS, ISO Certificates. If you want make certificates by yourself, we can provide sample for you. 3.Q: About Sample ? A: We will Charge for the sample first, but will refund after place order. Stock sample will be send within 3 days. Customized sample will be send with in 10~15days.