Harvey Building Products – Slimline Double Hung Windows. New Construction, new trim. Solid white, fusion-welded sash and frames are made of 100% virgin vinyl. The factory-calibrated balance system never needs lubrication or adjustment. Windows tilt in for easy cleaning (Who doesn’t love that?!) 20 Year Glass Coverage Warranty. Lifetime Warranty on all parts and mechanisms. We’re very thankful for our returning customers who appreciate a GREAT product!