Freemax M Pro Series Tanks are well received by many users, so do you also like M Pro and new M Pro 2 Mesh Tank? What’s more, now Freemax M Pro 2 Tank has two editions for options: Metal Edition and Resin Edition, so what’s the upgrade of M Pro 2 Metal Edition, compared to M Pro 2 Resin Edition? Both editions of M Pro 2 Tank are equipped with military-grade SS904L mesh and Tea Fiber Cotton formula (95% Tea Fiber Cotton plus 5% Organic Cotton) with Freemax 904L M1, M2,M3 and M4 Mesh Coil compatible. But the M Pro coils for M Pro Tank are also compatible with M Pro 2 Tank. In another word, M Pro mesh coils and SS904L M series mesh coils can support any other tank of M Pro and M Pro 2. The difference between these two editions is that M Pro 2 Metal Edition is designed with Child Resistant Top Fill Design and ISO 8317 Child Resistant Certified. All you have to do is simply lift and slide the top cap and then fill the tank, super easy and convenient. Mesh Pro 2 Resin Edition is designed with three steel balls into the top cap to increase friction, you can still fill the tank with a single hand but there’s little chance of loosening the top cap and potential leaking.