尼日利亚采购需求：布儒斯特角、浓度梯度晶体、倍频晶体、感应炉晶体、中红外晶体、钕玻璃激光器

I'm interested in purchasing chair covers and would like to know the steps to place an order for a set. Could you provide me with details on the available options, including sizes, colors, and materials? Also, it would be helpful to know the pricing and any bulk order discounts. Additionally, I'm curious about the shipping process and estimated delivery times. If you have any recommendations or popular styles that customers frequently choose, please share that info too. I look forward to your response so I can move forward with my order!