These are modification parts for enhancing the articulation of the RG Sinanju. They feature a newly designed waist and hip frame, significantly improving the range of motion. • Revamped hip frame structure Improves upon the previous looseness, allowing for more stable and wider forward/backward and side-to-side leg movement. • Double joint adopted for the waist Greatly enhances forward and backward bending, enabling natural action poses. • Enhanced side-to-side tilting movement Twisting and tilting motions of the waist become smoother, realizing more dynamic posing. These are reinforcement parts that can significantly boost the articulation performance of the RG Sinanju.