FocusTM Sleeves combine the simplicity of a ball drop without the need for intervention, saving on costly drill-outs. FocusTM Sleeves maximize Stimulated Reservoir Volume through single-point “open-pump-close” frac ports and enable operators to frac an unlimited amount of stages with no reach limitations. The sleeve is easily made up to the casing at operator-defined spacing intervals and can be cemented with casing or used with packers in open hole applications.