Designed to extend and enhance the grip of the P365 XMACRO module, and provide additional color and customization options. Compatible with our MK2 magazine base pads; while further compatible with SIG SAUER magazine base pads, the backstrap flare at the bottom--designed to flow with the MK2 base pads--may cause snags. It is recommended to only use this backstrap when paired with the MK2 base pads.