The high-performance cells are encapsulated in EVA (ethylene-vinyl-acetate) & placed between high transparent low iron tempered glass & a durable TPT (tedlar-polyester-tedlar) back sheet. The panels are framed using heavy-duty anodized aluminum frames, providing exceptional panel rigidity. Manufactured in China/Vietnam/Mexico. Visit us at www.Newpowa.com for more details. **For panels 50w and above, we only ship to 48 lower states unless additional postage is paid**