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From Pathfinder #193: Mantle of Gold, which isn't enabled.

Steadyfoot Tassel

ITEM 2
UNCOMMONCOMPANIONINVESTEDPRIMAL
Price 30 gp
Usage affixed to a creature
Bulk —

This handsome tassel comes in a variety of colors to match your companion's collar or bridle. While attached, the tassel gives the companion a +1 item bonus to Acrobatics checks to Balance, and to their Reflex DC against Trip attacks.

Pathfinder #193: Mantle of GoldOGL