@lauraslays If you are wanting to make it like mine, you will need a dowel, I cut mine to 4 inches. The base strings, making it sideways (like I did) is 48 but you want to double the length and only cut half, so that you can loop them around the dowel. 48÷2= 24
I always cut my base strings longer than necessary, because you can always cut shorter but you can't make it longer!
My tapestry (including the tassel ends) is 4 1/2 inches.