The following rope sizes are commonly used for hammocks: 3/16-in twisted cotton rope / 4.7mm or 1/4-in twisted cotton rope / 6.3 mm. We suggest the thicker 1/4-inch cord, as it has a higher tensile strength, and will feel softer for the end user. Ravenox makes this rope in more than 20 colors. We also make "three-strand" custom color combinations with any of our standard colors for the perfect unique hammock for your backyard.