High Grade
The Popular MBF-P02 Gundam Astray Red Frame in High Grade 1/144 Scale
The High Grade (also known as HG) model kits come in standard 1:144 scale were introduced in 1990, starting from the titular mobile suits of the first four TV series. These limited-run kits featured full snap fit assembly, an “internal frame” (for the first two kits, which provides better range of motion and were more poseable), and utilized the molding technique known as System Injection, wherein multiple colors would be cast on the same part.
These kits have since been produced from the mid-90s onward and feature better quality plastic and details as well as snap-fit assembly. While the practice of applying multiple colors to a single part did not continue due to quality control issues, parts from this line onwards were molded in multiple colors, even if they are on one sprue or frame.
It would later lend its name to the more advanced High Grade Universal Century, and more recently High Grade Gundam 00.