Dog-e-glows led collars are not only stylish and fashionable, but extremely durable. We've tested our products in a variety of ways to make sure you're getting the best product available. Each collar is available in 3 or 4 different sizes from Small to Extra Large. We offer a number of different patterns, all with different color led lights ranging from Blue, to White, or Red and even Green. There's a pattern for just about every preference out there. Pick your Dog-e-glow led collar today and do not forget the matching led leash as well!