Arredondo Base Pads come in several configurations for all types of applications. These extended pads increase magazine capacity with no permanent modifications to the handgun or magazine. Made of a durable nylon, these pads are almost indestructible.NoteExtended Magazine Base Pad Only - Does Not comes with a Spring DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.