Medium Ropes, 4mm-7mm are perhaps most commonly used, a great size for macramé beginners, more sturdy than the smaller ropes and the perfect size for plant hangers, wall hangings, furniture, lanterns, curtains, rugs, etc.
For those of you looking to develop your macrame knotting techniques and to showcase your projects, I would recommend high quality 3mm-4mm Single Strand Cotton Cord. The soft feel and ease of knotting, along side the effortless fringing, makes for the best type of macrame multi color cord thread to use. Stop getting tangled and get the basics right with these 3 easy macramé knots for beginners!