Your generous offer is appreciated, however I can buy a new pair of flip flops for less than you can mail those to me, they are $1.88 at wallyworld. You can make a cylinder cutter from a piece of metal tubing (as previously stated wrecked auto umbrellas are my favorite) Take a sharp knife and cut a strip the width to match the length of a hopper and cut a long cylinder from the side. You have the making of an hopper that is difficult to destroy. You can use it for a strike indicator while drifting your favorite nymph or soft hackle beneath it. If you don't like the color get out the spray paint and/or permanent markers.
It's easier to fool people than to convince them that they have been fooled. Mark Twain