A braided nylon, our Double Perlon Watch Strap with multiple color options available. Included are two keepers (one fixed, one free) for added security. The Perlon material is shipped directly from Europe which lends to the authenticity. This strap has an extremely lightweight, durable design! There is a heat seal which has been carefully applied to the end in order to prevent fraying. Thickness: 1.25mm Length ( 14mm ): 235mm* Length ( 16mm ): 270mm* Length ( 18mm ): 260mm* Length ( 20–22mm ): 255mm* *NOTE: Due to the characteristic elasticity of Perlon material, there may be some variability in length per strap with a difference of up to 5mm.