These are Tein brand front strut bump stops for GD-chassis Subaru cars. They work with Tein EnduraPro/EnduraPro Plus struts, or factory struts. These bumps stops are shorter than stock, so they are a good choice when installing lowering springs.
Sold as a pair of two bump stops.
Fits all 2002-2007 Subaru Impreza/WRX models, plus many other models, including 1998-2001 2.5RS.