Cropping of Items off a List by a <= Value

How can l drop Curve.Length values, where a curve is less than 2mm, therefore not desirable when wishing to use such curves to generate structural framing on mass?

Any assistance much appreciated.

Many thanks for your assistance.

I assume the ‘in’ from the boolmask is for true values?

Yes. In list are lines which met the criteria. Out lines are lines which did not.