Type of tree climbing and rappell system do jumpers use.

I am not a jumper but work in R5 on the Sierra NF as a foreman on a TSI crew. I am a trainee climber. My question is what type of rappell system do jumpers use when they get hung in a tree and also do they ever ascend back up their rope to gain entry into the tree versus using spurs and a flip rope. Reason I am asking is I am curious to find out if the double line with a prussic system is used. Also how much rope is usually carried by each person and what type. Thank you Burt Stalter

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