Here are four watch straps. They are not for individual sale. The silver stainless steel one is 20mm. The black and brown leather ones are 18mm. The orange-ish leather one is 16mm. The blue leather one is 10mm. Two are made by BAMBI, and one is by CREPHA. The blue leather strap is the original strap from a CASIO Sheen watch. As shown in image 6, there is some slight color transfer due to overlapping. Suitable for those who use various sizes for resale, etc.