I use a brand called Jackie' s Buck Lure doe in heat. I put cotton balls in a 35mm film canister. Duct tape a piece of close hanger wire to it so I can hang it on a tree limb and put the Jackie' s on the cotton balls. I hang 3 or 4 of the canisters around the area I' m hunting. If a buck catches a whiff of it he is almost sure to come in looking for the doe. It is very important to use a doe in heat lure only during the rut.