MSG Mecha Supply Assort 04 - EX Armor Set Gun Metal Ver. #MJ104 by Kotobukiya

This is an accessory pack for Frame Arms kits by Kotobukiya. They feature a peg-style connector. Some modification will be necessary to fit them onto 1/144 scale Gunpla. Depending on your model, they may be too small for a 1/100 scale Gunpla.