... high luminance, long lasting time in luminance and weatherproof.4) Can supply different level's quality for your specific reuqirements,like A ... -,A,B,C and D,and the quality D is our top quality for this item, with very long afterglow luminance ... stable chemical properties;7). On your request, we can supply the finished signboard, and the base can be PVC based,Aluminum, etc. glow green light ...