1.Are you a factory?A: Yes, Solar First is specialized in producing the solar mounting structure. we are the top level manufacturer which is verified by alibaba.2.Can we request sample before ordering?A: Yes, we welcome sample order to test and check quality3. What is your delivery time?A: Actually it depends on the order quantity, usually about 10 working day.Necessary information for us to design and quote1. Panel dimension: length, width and thickness?2. Roof type? Concrete roof/ tin roof/ tile roof ? 3. Panel layout? # row*# column 4. Max wind speed on project site?5. Max snow load on project site?