I used a similar method to create material inserts - strings for back and for seat of the chair, with the difference that instead of a round cross-section strings here strings are flat.

我用同样的方式创建了椅子后背和座位的填充材料，不同之处是平滑的线代替了圆线。

youdao

Ferguson of Priority One said Federer uses vertical main strings, made of gut, strung at 49 pounds and a synthetic brand called Luxilon Alu Rough in the cross strings at only 46.2 pounds.

WSJ: Roger Federer: With Tennis Rackets, He Strings Them Loose