:64: Both are products of the manufacturer FEWTURE. ES series are mainly Q 版 robots. Sizes are smaller. EX 合金 is bigger (around 25 cm tall) and very 重手 but limited movability. Most EX 合金 are the design of the 已故 "Robot 師" 佐滕拓 e.g. EX 三一, 鐵甲萬能俠, 柔王丸, etc. Very cool! But, in my opinion, mainly suitable for display.:64: Most important, the QC of EX is very unstable...:o