Hacky sacks make pretty good projectiles when they slam into something soft like the grass or a hand... but... or the asphalt, or a park bench and they don't last long. I made my own out of leather and the innards of a broken one which lasted wonderfully until it landed in the lake. It's funny how things filled with rocks don't float very well. The woven hacky sacks work well though a little more expensive.
This is the first slinging I've done at altitude. Of course, around hear 4500 ft really isn't anything at all. In fact "dara" means hilltop, or something like that anyway. "Mountain" or himal can not be applied unless there is snow on it year around. The best thing about slinging in the Himilayas is the cricket balls. The ones sold in the shops around here are tennis balls filled with something to make them a bit heavier like a cricket ball. It's the perfect slinging size and weight. The worst thing about slinging in the Himilayas is that behind every bush and signpost there are ten people. Almost anywhere I go is to dangerous to sling... So to the mountain tops... I mean the hilltops I shall go.