英国采购需求：粗蛭石、块状蛭石、植物用蛭石、细蛭石、块状粗蛭石、蛭石土

I hope this message finds you well. I have some questions regarding your products and their specifications. While I believe I have a solid understanding of the general features, there are still a few aspects that could use further clarification. Could you please provide more details about the materials used and any customization options available? Additionally, information about lead times and bulk order discounts would be greatly appreciated. Looking forward to your response so we can move forward smoothly. Thank you!