AR16x - v2.1 is a release file of the Minecraft resource pack Advanced Rocketry Pixelated - AR16x16, made for Minecraft 1.12.2. It was published on November 13, 2021 and is 7 MB in size. For the full description, screenshots and every other version, visit the Advanced Rocketry Pixelated - AR16x16 resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.