Below are the brushes in my hand. For reference, my hands are small (but not tiny) and I wear a US size 6 1/2 glove. Also, I have used all of the brush sizes from Leistner and have not had any problems with not fitting in my hand.
Hoof Brush w/Handle
Medium Goat Hair
Face Brush (for sizing of the Ultimate Horse Head brush)
Hedgehog Mane & Tail (for sizing of the Woody in Ecru)