GERSON FINE PAINT STRAINERS - Strainers are produced from dense white paperboard to reduce paint bleed through. Highest-quality U.S. produced filter media, bleached and calendered for purity and uniformity. Custom woven to exact specifications for proper filtration. Two micron-rated openings to accommodate all filtration needs. Superior proprietary adhesives, both water-proof and solvent proof are used throughout. Product is sold by the each. 1000 strainers per case.