Brake pad wear indicator.
These fit to the brake pads and indicate when the brake pads are worn and need replacing. They should be replaced each time you replace the brake pads.

2 required per vehicle, sold each.

To fit:
Boxster (986) 2.5-2.7 1997-2004 Front
Boxster (986) S 3.2 1997-2004 Front
911 (996) C2/C4/C4S 1998-2005 Front and rear (not ceramic brakes)
911 (996) Turbo 2001-2005 Front and rear (not ceramic brakes)
911 (996) GT3 1999-07/2002 Front and rear (not ceramic brakes)
911 (997) C2/C4 2005-2008 Front and rear (not ceramic brakes)