outwater plastics black 3/4'' styrene plastic u-channel/c-channel 36 inch lengths (pack of 4) outwater outwater’s selection of u channel mouldings includes our multifunctional color plastic u channels. these mouldings are an economic alternative to metal mouldings and can easily be used with foamboard, cardboard, and custom pop displays for extra edge protection. the color plastic u channels offer clean finishes for shelving and display edges and are easy to miter onsite to create unique frames. these mouldings can be used for a large variety of applications such as: edge protection covering seams shelf edging impact protection