1.Four digits size : 0.25inch to 1.2inch 2. Series of color can be selected 3. OEM of LITEON Tianjin Company Red610nm-640nmAmber 590nm-610nmYellow 580nm-585nmKelly560nm-580nmGreen501nm-540nmCyan490nm-515nmBule 455nm-490nmPurple 380nm-410nm Four digits size : 0.25inch ,0.28inch ,0.30inch ,0.33inch ,0.36inch ,0.39inch ,0.40inch ,0.43inch ,0.47inch ,0.50inch ,0.52inch ,0.56inch ,0.8inch ,1.2inch . ...