The DO-UP SHELL, featuring natural Japanese abalone, has been released by DO-UP. The surface, coated with hard coating in natural Japanese abalone style, has been finished to high quality so that it won’t break even if you miscast onto large rocks or bedrock. The river width is narrow and doesn't allow for cross-stream casting. Moving upstream puts pressure on the target. After repeatedly testing in all kinds of locations and situations for one season, we have arrived at this specific length, width, thickness, curve (carving), and shape. The enticing dance in cross and downstream is spectacular, but DO-UP truly shows its value in upstream fishing. The appeal of DO-UP in upstream fishing offers a new option for anglers that was not available before.