Suggestion: Make some prototypes and give them to some people/a team for testing. It will cost you a bit initially but people will be a lot more willing to buy them if they can see them work/feel the weight/have a go using them. You'll also be able to find out how thin you can make them.
Suggestion: Make some prototypes and give them to some people/a team for testing. It will cost you a bit initially but people will be a lot more willing to buy them if they can see them work/feel the weight/have a go using them. You'll also be able to find out how thin you can make them.