These caps are designed to be factory replacement caps, not covers. CNC machined from 6061 aluminum.
2008-14 WRX/STI Engine Bay Cap set includes:
Material - 6061 Aluminum
Black (Anodized)
Blue (Anodized)
Red (Anodized)
Silver (Raw)
Neon Yellow (Powdercoat)
Hyper Teal (Powdercoat)
Red Wrinkle (Powdercoat)
White (Powdercoat)
Hyper Pink (Powdercoat)