Features various colors to classify lab objects such as lens size, focal lenth and so on 1 Features various colors to classify lab objects such as lens size, focal lenth and so on2 Please add the preferable color behind item No. while placing order R - red G- green B - blue A - gold C - gray S - silver white3 Ordering Information PH-1G > Ø= 12.7 mm, Height = 1", Green color