Frøymix Sinking rope 22mm coil 110m Frøymix is a synthetic fiber blend of danline and polyester, which provides very good resistance to chafing and wear. The rope sinks in the sea and has a specific gravity approximately equal to nylon. Specific gravity: 1.15. These properties make the rope particularly suitable where the rope should sink and not get on the propeller, and is smart to combine with danline that floats closest to the bottom. Frøymix is used in end rope/line rope, tenon rope, fishing line and is good for tying where bending is needed.