法国采购需求：NANPU 空气喷砂机、虹吸式喷砂机、重力供料喷砂机、工业喷砂设备、专业喷砂枪、气动喷砂机

I'm interested in understanding the specifications of walnut shells you provide. Specifically, could you clarify the maximum coarseness that your walnut shells can accommodate? Knowing this will help us determine if they meet our requirements for processing. Additionally, I'd like to get more insights into the different grades or textures you offer. Our operations are based in the United States, and we are looking for reliable suppliers who can provide consistent quality. Any additional details regarding your packaging options and shipping timelines would also be appreciated, as it will help us streamline our procurement process. Thank you!