We use 2mm nylon paracord imported from Europe. The hardware is made in Japan or Europe, and the adjuster belt uses Biothane. Width: Approximately 3.5cm Thickness: Approximately 6mm Color changes are possible. (For this design, you can choose your favorite 4 colors.) Price is for collar sizes up to 35cm. After that, an additional charge of 500 yen will be added for every 10cm. In addition to the adjuster belt type shown in the first image, we can also make a half-choke type like the one in the seventh image. (The half-choke type without a belt is 800 yen cheaper, at 3400 yen.) Matching leashes can be made with 4mm cord. If you would like to change the specifications, please comment and we will discuss it on a dedicated page. Discounts available for multiple purchases and repeat customers. You can check out other designs at #asowan_sakuhinshu☆ Thank you for viewing.