Finishes off the mat nicely. Easy to fit too. The contrasting color helps to see the edges of the mat with my peripheral vision - handy when carrying bulky boxes. The anti-trip edge pieces are made of high quality PVC just as the body of tiles that make up the mat are. The two types of edging - for both the exposed and hidden interlocking edges - ensure a neat edge finish all the way around the mat. Find on the Home Depot website by searching for this unique reference number, 320813288.