As we all know, 904L M Mesh Coils are designed for new Freemax M Pro 2 Tank, and M Pro Mesh Coils are for M Pro Tank. However, 904L M Mesh and M Pro Mesh can be compatible with each other’s sub ohm tank. And can you find any difference between the two kinds of mesh coils? 904L M Mesh Coils Introduction: M Pro 2 Tank adopts FM Coiltech 4.0 with military grade SS904L mesh and Tea Fiber Cotton formula (95% Tea Fiber Cotton plus 5% Organic Cotton), providing users with the best vaping experience which is even better than all the best sub ohm tanks in the market. Freemax 904L M Mesh Coils have Freemax 904L M1, M2,M3,M4 and M5 Mesh Coils available. M Pro Mesh Coil Introduction: Freemax M Pro applies the Freemax patented cotton formula, which is 90% Flax Cotton Fiber and 10% Cotton Fiber, this is the reason why the Freemax Multiple Mesh Coils have an average lifespan of about 2-3 weeks. There are single/double/triple/quad/ quintuple mesh coils compatible with M Pro Tank.