20mm FKM (Patterned) Rubber Strap with Quick Release Feature for Fast and Easy Fitting and Removal 18mm NATO Straps they are heat-treated to remove

they are heat-treated to remove internal stresses

but there's now a simpler alternative

These watch straps - available in 18mm - were very widely used in the 1950s and 1960s prior to the introduction of today's nylon NATO straps

when MWC was commissioned by a U

Ideal for both beginners and experienced watch repairers

20mm FKM (Patterned) Rubber Strap with Quick Release Feature for Fast and Easy Fitting and Removal 18mm NATO Straps they are heat-treated to removeFKM2 FKM, short for Fluoroelastomer, is a high performance synthetic rubber known for its exceptional density, durability, and resistance to water, chemicals, oil, and heat. Originally developed for aerospace applications, FKM was designed to meet the stringent reliability and longevity requirements of aircraft and space missions. These qualities make FKM straps highly favored by military personnel, police officers, and professional divers, as they