Create a core for your rock using a handful of wool stuffing, pull off thin a piece of your roving and lay core on top. Place another thin layer of roving and roll up in the opposite direction. Roll as you would a ball of yarn, changing direction and tucking in corners. Sometimes it helps to have slightly moist hands. Don’t worry if it’s not right you can always unroll and re-roll if needed. Place rattle in center of your core if you are using one, they are water tight so just throw them on in, you will want to keep your rock on the smaller side, 4 inches or less, so rattle sound will still be clear. Your finished rock will be about two thirds the size of this looser form. If you want to make your rock larger you can add more colored roving to outside, or start with a larger core.
Step 3 Pass rock from one hand to another, carefully as if it is an egg, this will help toughen the wool rock and keep it from coming apart. This is the hardest part of wet felting and it’s really not that hard. After about 20 or so passes you will notice your rock will appear less stringy and more solid. This will take a few minutes and you’ll know your done when your wool feels more firm and looks more secure.