This is actually not the Maltese Cross, as the Maltese Cross has 8 points, which would be very sharp and probably dangerous if put onto your cuffs. According to Wikipedia, this is a ; "cross patt eacute;e" which is a variant of the Maltese Cross. Isn't it lucky that Wikipedia could clear that up for us?
Dimensions (LxWxH): 19mm x 19mm x 3mm (approx.)
Weight per cufflink: approx. 6g (light)
Size = x mm (W x H)