Roaring Spring Paper Products Biobase Filler Paper. Be environmentally friendly by using this filler paper. The smooth, 20#, white writing paper is produced from 30% sugarcane post-agricultural fiber and 70% post-consumer waste. Paper is High-Performance 20#, enabling writing on both sides of the sheet. Each pack contains college ruled sheets with a red margin line. The paper is 3-hole punched. Polywrapped with a printed topsheet. Proudly made in USA!