t does wool.
What you do is to pick out a whole bunch of cool little goodies, and a ball of yarn, and wrap them all up together to make a magical goodie-filled yarn ball (hence the name...) and send them off to their intended recipient, who may either unwind the entire thing on the spot, or slowly knit it out, depending on their personality type.
I got paired up with Sarah, and sent off her lumpy bumpy rattly yarn ball this morning. Fingers crossed it gets to her quickly and safely... and that she likes all the things I wrapped up! I'll post my pics of what's inside after she's got it - no need to spoil the surprise!