Reminiscent of Lost in Space on the telly.

(Please don't tell me if you don't remember it!)

Robot
Dimensions (LxWxH): 16mm x 24mm x 7mm (approx.)

Weight per cufflink: approx. 8g (light)

Space Blaster
Dimensions (LxWxH): 19mm x 13mm x 5mm (approx.)

Weight per cufflink: approx. 6g (light)