https://smashmockup.com/minimal-floating-us-letter-brochure-mockup/

Free floating US letter brochure mockup to present the inner pages of your brochure design in an exceptionally attractive way. Get the PSD source files and you will be able to edit this graphic with smart layers.

This fully layered PSD file allows you to show off your design. The PSD file allows you to change all elements and come with many customization options. Completely layered file with smart object.