美国采购需求：羽毛球拍穿线机，网球拍穿线机，网球穿线机，s616，穿线机

I'm interested in your tennis racket stringing equipment for delivery to the USA. Could you provide detailed information about the specifications, features, and pricing? I'm particularly curious about the lead times for shipping and any warranties or support services you offer post-purchase. Additionally, I'd like to know about the bulk ordering options and if there are any discounts available for larger quantities. It would be great if you could send some product images as well. Please share any relevant certifications or compliance details, especially for import into the USA. Looking forward to your prompt response.