Default 3D Medium 1.13 is a release file of the Minecraft resource pack Default 3D [16x], made for Minecraft 1.13.1, 1.13, 1.13-Snapshot, 1.13.2. It was published on February 3, 2019 and is 13.1 MB in size. For the full description, screenshots and every other version, visit the Default 3D [16x] resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.