... many many times without any scratches.4) erase easily with soft cloth or duster5)lifespan of leds : more than 100000hs6) spare part ... : markers, adaptor, duster,chain,hook,cloth and so on.7)With ROHS CE UL GS SAA ... board shinning and flashing4. spare parts: markers adaptor chain duster cloth hook and so on Application:restaurants,clubs,hotels,pubs,cake ...