This is a glass copper lens with an internal silver mirror coating.
The G3H9 is an excellent sight fishing lens as it is a high light transmitting lens. It is particularly good in areas with muddy water such as north Australian estuaries where anglers chase the highly prized barramundi. The copper lens is excellent at reducing glare and providing a spotlight on movement in brown water. It is also excellent as a general sight fishing lens on flats. It is a muted copper lens which means it is comfortable for general saltwater use also. This lens is suitable in all variable light conditions. It is also an excellent driving lens.