美国采购需求：山地自行车头盔、城市头盔、城市头盔、智能头盔、电动自行车头盔、通勤头盔

I'm looking for detailed information on your cycling helmets. Specifically, I'd love to know about the materials used, safety ratings, and any unique features your models might offer. Also, it would be great to get insights into available sizes, colors, and any customization options you provide. Could you please share your pricing structure and lead times for bulk orders? I'm particularly interested in understanding any minimum order quantities and potential discounts for larger purchases. Your prompt response would be much appreciated as I'm comparing options for an upcoming project.