We are always stuck with asking people to go into their local jeweller in the UK,Tokyo,US etc, to check their ring size. Now we can send them this little kit, and they can let us know.
Knowing some of our enterprising customers (with a penchant for spur of the moment proposals) we can see people giving these as the proposal ring, following up with a stone, then leaving their nearest and dearest to do the actual design…quite a modern sequence.