Q: Do you provide samples? Is it free or charged? · We'd like to supply 1 sample for your checking, cost and freight paid by buyer. Q: How long is your delivery time? · Usually it is 3 working days; · For bulk order, it's about 15-working days, depended on exact quantity and order date. Q: Is it possible to customize special lens? · Yes, to customize and design special optical element and coating are available here. Q: How to pay? · T/T, Alibaba online assurance payment, MoneyGram, West Union, Paypal and so on. Q: How to ensure the safety of payment? · VY Optics is a reliable supplier not only audited on Alibaba, but also on Made-in-China, reputation and quality is life of our company, and we support Alibaba Trade Assurance. Q:How do you ship goods? · Low value sample: EUB, E Express of China Post, which is cheap; · Light weight parcel: DHL, FedEx, TNT, UPS, EMS, SF Express, China Post; · Heavy cargo: by air or by sea, ship on pallet. Our company enjoy a considerable discount owing to long-term cooperation with courier company.