I just finished making my first bass string in my garage... I do not have a micrometer handy at home today so my best guess using a tape measure is that its roughly 5/16" of an inch thick. however that converts... I also do not have the ability to take a picture and post it. I am taking it to the NAMM show to deliver to a bass builder that i admire: Skip Fantry of Knuckle basses Its merely a gift for Skip and I wont be making any more bass strings... so when you do finally see it... and EVERYONE wants one, dont ask ... i dont think i can pull it off a second time. It was really tough to make at home! Securing the ball end was serioulsy difficult! It will belong to Skip, hopefully he will be able to post some pictures of it???