No idea, but not only is it the best rep strap I've ever seen, it's also long enough for my fat wrists! it's 24/24mm and 130/75mm long and 4mm thick.
They are great straps. Bonesey I noticed yours looks like mine where as the strap is a little thicker on the end where it attaches to the bottom end of the case causing it to rub a bit.
I oiled mine up to make it darker..
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It is by far the best rep strap i've ever had, nice and thick excellent stamping and 24mm buckle, easily on a par with my kaktus beater strap and worth $50-$60
Does this strap come standard with the 390?
Your wrist is a wookies wrist Mambo; just as Q5?´s