Here is a link to the strip stick (pressing bar):
http://thestripstick.com/buy_products
I bought them and really like them. As far as I can tell, they are half-round trim (lots of hardware stores have quarter-round trim; it can be harder to find half-round) covered with muslin that is serged on one long end and the two short ends. (I think it would be hard to do this on my home serger; the serging is very close to the wood and very precise.) I don't think there is any batting underneath the muslin, but maybe an extra layer of muslin or flannel as the muslin is not see-through. Someone posted that they didn't even bother to cover their half-round stick with cloth and it still worked great. The only thing is that wood contains acid, so covering the wood with cloth would be more protective of your strips.