The At'trac Sling has been discontinued. If you're looking for something new, check out the best sewn runners for 2019.
Here's what other sites are saying:
Petzl At'trac Lanyard for Trac FEATURES of the At'trac Lanyard for Trac by Petzl Easy and secure : attaches to a harness with a lark's foot knot (without a carabiner). Equipped with a STRING to aid correct orientation of the carabiner. Can be used together with the TRAC. ALL CLIMBING SALES ARE FINAL.
Historic Range: $17.95