Object start with F and U

Hi,this is my 1st time post.Please forgive me if anything not right.

English my 2nd language.Please help me on this riddle.

Clue.

-Word F and U.I dont know got letter u or shape like u.

-Tall 3 inch.After separated 2 inch.

-The couple/combination color full.

-Pairs/When separated cant use

-Related to fisherman.Sometime fisherman angry with this "thing".

-When new,beauty sit,located very well.When old,ugly lying around/idle.

-Got veins.

-Faded in time

-Tie,binding.Slippery and got hole.

-Got big and small hole.Not many hole.

-Long,lenghty and short,low.

-Got shape and bank.Got corner,not round,no head.

-Get rust when exposed to salt water.Not heavy not light either.Tie/band/sheaf.

-Without You im nothing.

-Worldwide item.

-fisherman equipment.

-Got 8 corner.(box shape?)