One thing I use, I'm disabled and have trouble cutting fabric when I'm not doing well, is jellyrolls. It's 2.5" and works well. Just buy the kona solids (bella has some too and jr rolls too which if you don't need it for more than one quilt might be an option) I always have white, snow, a grey and black on hand for when I can't cut. When I do cut I normally make them 2.5" but the last time I cut it to my ruler which is 3" and loved it! I've never really quilted much on a curved edge so I'm not sure which is easier to do. But I would just use the stuff they sent try it on something small to see how you like it. If not try the jellyrolls, you do have to sew the pieces together end to end and then iron them in half but it takes no time at all.