FN 663225 FNX 15rd 45 ACP Stainless/Black Steel
https://www.tandktactical.com/shop/845737002541-fn-663225-fnx-15rd-45-acp-stainless-black-steel-12391
https://www.tandktactical.com/web/image/product.template/12391/image_1920?unique=d72e82f
This magazine is compatible with your FN FNX. It features a polished stainless steel body with a black polymer base pad.