Each full set includes 2 long-prong glossy round caps, 1 socket, and 1 stud.
All snaps are glossy finish.
Prong length refers only to the cap piece. #16 sockets and studs can be used interchangeably with all lengths of #16 caps. In other words, the socket for 5.2mm caps are the same as the socket for 6.2mm or 7.2mm caps; the same is true for the studs.
Snaps are packaged by weight so count is approximate.