Purdy Spirex offers the next level of performance featuring a patent-pending formula powered by spiral filament technology. The medium stiff Spirex filament blend delivers a superior smooth finish with 50 percent more coverage compared to Purdy XL when used with premium paints. Designed for cutting in straight lines with precision, Spirex is compatible with all paints and stains and provides advanced cleanability-making it ideal for every project and helping you work fast and more efficient.