Drumsticks which are used outside eg by military bands can be hard to handle in cold weather (especially if the uniform doesn’t include gloves).
Today’s invention is to equip drumsticks with a hollow core into which can be inserted a tube of exothermic chemicals.

Any problems arising from the effect of this on the balance of the sticks could be addressed by fitting a small, screw-out weight to the distal (ie non-drumming) end of each to help finetune its feel.