Rhythm Rhythm Rhythm!!
You fit your thumb in the molded thumb depression of this all rubber pick, made of a silicon rubber with a high number on the Shore Scale for durability. You strum mostly with your fingers and use the "Bluesthumb" to accent the sound of your fingers, like you would with your natural thumb, but the strings can be hit harder with no wear on your real thumb.
At first it may seem that space aliens probably carved these prototypes out in ancient times,
but actually they were designed on the computer