This filter for the M30 series flashlight is ideal for use by hunters and fishermen because the green light is less likely to spook prey and tends to not attract insects. A green filter is also useful in covert operations and cuts through smoke or fog filled environments very well. The filter is made of a high quality TPU body that is extremely flexible, durable, and chemically resistant. The lens is constructed from ground glass and features a high-quality anti-reflective coating on both sides for optimal light output. A lanyard loop is built-in to the filter for easy transport and storage.