Grape Solar PhotoFlex-100W Monocrystalline Solar Panel for RV's, Boats and 12-volt Systems Advanced technology back contact cells allow for flexibility and increased wattage per sq. ft. Unique frameless design includes four metal reinforced mounting holes for easy installation High transmittance, flexible lamination material is less prone to cracking than traditional glass Two blocking diodes prevent reverse current flow Positive and negative leads equipped with MC4-comparable connectors