This aggressive high-pitched call sends even the wariest cackler to a "short drop and sudden stop." The smallest short reed on the market blends volume speed and ease of use. A must have for small geese and wary late season birds who think they've heard it all...Until now! Delrin is a softer more dense material than acrylic. Same machining process that the acrylic calls undergo but a softer more mellow sound. Only comes in flat black but it is just as tough as your favorite acrylic call.