The plates forming the outer strakes are heavier than the remainder and are known as the stringer plates, and the edges where they join the side plating are known as the boundary angles .
Ezi zigqumo ezenza imichwe yangaphandle zinzima kunezo zisaleleyo kwaye zaziwa ngokuba zizigqumo eziziziqhagamshelanisi, kunye neziphelo apho zidibanisa khona intshukumo yesigqumo eyaziwa ngokuba zi-engile zemida.