About This Solar cell: Made of Grade A PERC Monocrystalline solar cells with much higher efficiency(22%) and more durable than other mono solar cells.Premium EFTE Film: This film features superior light transmittance and weatherproof performance, and is also heat, corrosion, and UV resistant. ETFE also has self-cleaning abilities, ensures the best performance day after day. Backboard: Durable fiberglass backboard with better heat dissipation and heat resistant PET/TPT board,which ensures a long lifetime. ETFE film and fiberglass backboard, it can withstand extreme environmental conditions, maintenance-free for years. Ultra-thin:At only 3mm thick, the solar panel is powerful, waterproof, lightweight, durable, and highly resistant to the harsh operating conditions of a marine environment.Lightweight,weigh approximately 30% of a glass framed one. They’re a great choice where you want big power without sacrificing fuel economy, or don’t want any extra weight on your roof that may affect your center of gravity. J-Box: IP68 Waterproof junction box with bypass diode and blocking diode safety protection. 5. 24 Months Warranty:Lensunsolar solar panels come with high quality , solutions given for your questions and a 24 Months product warranty from the day of your purchase. Overview Brand : LENSUNSOLAR Material : Monocrystalline Silicon Product Dimensions : 42"L x 14"W x 0.01"H Item Weight : 2.2 Kilograms Efficiency : High Efficiency