The WOOSTER™ Lambswool 100 paint roller cover features a buff colored, 100% natural lambswool knitted into a synthetic backing for consistent quality. Roller quickly applies stains, waterproofing, and all flat or satin paints, including latex. Green™ double-thick polypropylene core resists water, solvents, and cracking. Note: Use with paint roller frames, Nos. 3UW50, 36T210, and 36T233 (sold separately), and paint trays, Nos. 3UW75, 14A047, and 36T231 (sold separately).