Some savvy innovation went into this "hook and catch" set that totally rethinks the button concept. These are Bakelite button components in olive green and bright maroon. Both pieces have regular looking buttonholes, but neither piece does its job without the other. Beware of antique dealers who try to sell the fly-shaped hook piece all by itself and call it a bug button. Nope! These little smarties work together or they're just nice-looking scraps.