Shadow could be "dropped" at any main stripe side or both sides. Select respective Shadow Position to enable it.
Note: If
Shadow Amount is set to 0, then no shadow would be visible. Shadow is just another gradient type stripe drawn next to the main stripe. The shadow gradient rendered as solid color to transparency creating shadow effect for the main stripe . The color of shadow for each main stripe side could be selected under

and

columns. The Shadow could be
Inversed. Check the

box to inverse shadow. Inversed shadow turns the transparent side of shadow toward the main stripe. Controlling a proper amount of inverse shadow, shadow color, spacing, main stripes color and set of background gradient types and colors could render a "glass" and other interesting effects. Finally, the main stripe could be made transparent. Degree of transparency controlled at
Opaque column. Setting respective stripe opacity to 0 would make it fully transparent. Shadow is not affected by opacity, thus shadow alone could create stripes. If you for instance set opacity to 0, enabled both shadows, made it inverse and assigned different colors for each side of the shadow, then the result would be a stripe with 2 color gradient faded to transparency at the center of the stripe making "glassy" pipes.