The E.R. Jahna 104N is a Yellow Nylon Coarse Sand Bag. American owned and independently operated, E.R. Jahna Industries has been a leading supplier of construction aggregate materials to Florida for over 60 years. Whether it be beach re-nourishment, concrete products, golf course sand, manufacturing, or infrastructure, E.R. Jahna Industries has and will continue to be your trusted source for high quality and reliable aggregate products.