First time attempt by student climbing guide, she's a Thai student at local university. Currently there are two slacklines at Boomerang Adventure Park, each with overhead 10 mm steel safety cable. Each goes between large rocks. The slackline itself is 3 inches wide.

Taken from the take-off platform. Two boys do their first zips on the 160 meter parallel zip lines - at Boomerang Adventure Park, northern Thailand. Yes, there's a fee, but it's less than $2 each.