Are these any good?
http://www.daystarweb.com/productdetail.php?productID=679
They look convenient, but I doubt they're enough on their own. Seems like you'd need regular bumps as well.
http://www.daystarweb.com/productdetail.php?productID=679
They look convenient, but I doubt they're enough on their own. Seems like you'd need regular bumps as well.