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:
911 (996) GT3 2004-2005 Front and rear (not ceramic brakes)
911 (997) C4 2005-2008 Front (not ceramic brakes)
911 (997) C4/C4S 2005-2012 Front with ceramic brakes (PCCB)
911 (997) Turbo/GT2 2007-2009 Front all models including vehicles with ceramic brakes (PCCB)
911 (997) Turbo 2010-2013 Front all models including vehicles with ceramic brakes (PCCB)