Sisal cord is a versatile natural fiber item , and understanding its differing thicknesses is key for choosing the appropriate option for your task . Generally, sisal cord comes in sizes spanning Sisal Rope 1/8 inch to 1 inch in thickness , with common sizes being 1/4 inch, 3/8 inch, and 1/2 inch. Larger ropes (like those over 3/4 inch) are typical