Sabai balls
I purchased two sets and at first I hated them. They have ALOT of camphor in them and to me, they smelled like my grandmother's closet. However, my clients love them. They don't notice the smell. Instead of the electric steamer, I recycled my baby's microwave sanitizer. I steam the balls in the microwave as needed and use them as spot treatment to relax muscles. I tried putting them in the hot stone warmer, but the aroma of camphor all day made me sick!
Also, I was curious if I could make my own. I bought some muslin and wrapped up lavendar, hops and some other herbs. My balls aren't as pretty but I heat them up and really they do the same thing as the sabai balls.