Q1: Are you a trading company or a manufacturer? A: We are a factory. Our factory produces all items related to the greenhouse, so we provide the best price. Q2: Do you provide samples? Is it free or extra? A: Yes, we can provide samples free of charge, but we don't bear the freight. Q3: How should I choose a greenhouse system? A: Please let us know where the greenhouse is (temperature, wind speed) Q4: How to assemble the greenhouse when purchasing? A:We have professional after-sales service engineers who will provide planning drawings and installation manuals. You can communicate with him from time to time.