Off Topic I guess...but..
For throwing lines over limbs etc, I use a plastic bag filled with sand or dirt. The line is bio-degradable string.

When the line gets tangled in the trees (which is quite common) the rig will eventually rot, the sand will drip out and it will all "go away" in a few years. I have seen a number of rock "fruit" on trees.

Also, don't need to carry a special "throwing weight".

Not to mention that if it springs back and lands on my windshield it will not break it. At least so far.....

Nomad