I know the banks provide a 'letter of credit' for this type of thing that both parties sign and provides a level of security ref quality, delivery etc. i.e. compensation.
Probably a minimum spend though and you would need a sample first too in order to compare against the full order received.
I like the idea and probably would have a pair but would just prefer a nice 'Z' symbol would that not be better looking?
ONLY my opinion though no offense intended.
Mine was my gym nickname (flex) after me and a friend saw a famous American bodybuilder on tour once (Flex Wheeler), that was extended to flexiballs by the gym owner and I just use it for all gaming and usernames but abbreviated to flexib
Quite sad but there you go.