For the best answers, search on this site https://shorturl.im/aQnO1. The standard atmosphere (symbol: atm) is an international reference pressure defined as 101325 Pa and formerly used as a unit of pressure.
stringer - a member of a squad on a team; a first stringer; a second stringer. team, squad - a cooperative unit (especially in sports) player, participant - a person who participates in or is skilled at some game.
So that way it won't break and it adds to the performance of the boards. Basically when you compress it in to your turn the stringer bends and when you come out of your turn it flexes the board and it projects you out of your turns. And that's what the stringers are for. There performance and they're also for strength.