It's an orange rubber strap from Hirsch - the colour isn't quite right on the photo, it's a bit less sickly looking in real life.
I assume you meant the Flight Timer, but if interested, my X-33 was originally a Kevlar strap Gen 1, but came to me on an Omega titanium bracelet like the current Skywalkers, the Kevlar having presumably long ago disintegrated.
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