I've never been surprised that someone made a set of butterfly cufflinks, but I am a bit stumped about these ones. Really lovely cufflinks with quite a lovely detail. But they're caterpillars.
Plated and enamel cufflinks.
Dimensions (LxWxH): 27mm x 10mm x 6mm (approx.)
Weight per cufflink: approx. 7.30g (light)
Size = x mm (W x H)