The extesion
straps are made of the same materials that the regular
straps are made of(elastomer).
They look like the
straps on the watch
bands, but it is a buckle and a holes
strap.Basically it is designed to be used to extend the
strap by putting it on the buckeld end of the exsisting
strap, and attaching the holed part of your watch
strap to the extender buckle.