Ivory bra back fastener. 

Two batches got mixed up, so there is the possibility that the hook side (the small bit), may be a slightly different shade to the eye side.  The eye sides are all the same, as they were easy to differentiate, but after many hours of sorting I was struggling ..... hence seconds, priced accordingly (you have a vert good chance of getting a packet of 3 perfectly matching fasteners, but I always like to err on the side of caution!)

photograph of a packet picked at random.