What is it? What do you use it for?? Really need to give more description explaining what this stuff is.
Rosin is used for a number of things, this type is usually used in a fabric bag and tossed in the hand to provide grip. That thing behind the pitcher’s mound on a baseball field? Bag of rosin. The thing gymnasts rub all over their hands before using the parallel bars? Yep - rosin (usually in powder form, though). Fishermen might even use it to tie fishing flies, violin bowmakers use it when they re-hair bows.
So, if your weekend plans involve throwing curveballs at gymnasts, this would be the product for you!