exec aim.cfg Then type:

// ---- Key binds for aim practice ---- bind "F3" "cl_crosshair_size small" bind "F4" "cl_crosshair_size medium" bind "F5" "cl_crosshair_color 0 255 0" // Green bind "F6" "cl_crosshair_color 255 0 0" // Red bind "F7" "cl_crosshair_color 255 255 0" // Yellow

sensitivity to verify your setting.