This is one of the best long narrow bore 510 mtl drip tip for your 510 tanks. it is made of Stainless steel , 25mm long and 3mm narrow bore will bring you nice mtl vaping. Working for all 510 tanks, such as kayfun prime V3 V4 Lite Plus Five pawns, Taifun GT3 GT III/GT2 GT II, Wismec amor NS MTL tank, Hellvape MD RTA, Precisio MTL Pure RTA...