This is a pseudo 3D PSD slipcase book mock-up with dust cover to display any print designs. The free PSD slipcase book mock-up will give you an idea of what the final cover design of your book might look like once it's printed. All you have to do is place your graphics in the smart layers, hit the save button and the job is done. You can also customize the mock-up to your liking by placing your designs through the smart object layers.
Thank you Pixeden for this interesting mockup. If you are interested in more free graphic, web and design resources, feel free to visit their website.