NOT PLASTIC BUT RESILIENT NYLON 12A MATERIAL =VERY GOOD.
MY WATCH STRAPS ARE 16MM SO THE 20MM WATCH STRAP IS NO GOOD FOR ME BUT I AM VERY HAPPY WITH THE MATT BLACK ZIPPER COMPASS HOLDER. I BOUGHT TWO & THEY ARE GOOD VALUE FOR MONEY. I HAVE IT TIED ONE AROUND MY NECK 24/7; EXCEPT FOR WASHING OR SWIMMING,ETC. THE CORD SEEMS VERY DURABLE & UNLIKELY TO SNAP.
ONLINE I SAW SOME HAD BOUGHT A BRASS OR TITAINIUM PLASTIC BUTTON COMPASS HOLDER FOR THE FRANCIS BARKER BUTTON COMPASS BUT THEY ALL INVOLVED FF'ING ABOUT TO STOP THE F/B COMPASS FROM FALLING OUT OF THE BIGGER DIAMETER HOLDER & THAT INCREASES A POSSIBILITY OF FAILURE DOWN THE ROAD SO I DECIDED IT WAS SAFER TO BUY THE NYLON STANDARD HOLDER = IF IN DOUBT - DONT !! & IT SAVED ME ALL THE FF'ING ABOUT WITH METALWORKERS EQUIPMENT THAT I DO NOT OWN. KEEP THINGS SIMPLE EVERY TIME.