Fuji Guides BMNAG guides are light in weight yet extremely strong. Their S4 stainless steel frame and concept shape make them an excellent choice for medium to heavy duty casting or spinning rods. Fuji BMNAG guides are stamped from one sheet of stainless steel and then anodized black for strength, durability, and beauty. They also feature Alconite rings which provide very strong yet thin rings for the ultimate in strength and sensitivity.