Freer extra hard hornwood timpani mallets (HS2H). However, I do not recommend purchasing because they have failed on me in concert before and I have had to use superglue to repair them. Their customer service is also terrible. There are plenty of cheaper options out there!
He added a small one left of the lowest one to have an easier time playing as some quick jumps from the lowest to highest timpani are required. It’s easier when they are next to each other rather than with two other timpanis in between :)
