Grape Solar GS-STAR-50W Polycrystalline Solar Panel, 50W Positive and negative leads equipped with MC4-comparable connectors Rigorous quality control to meet the highest international standards High transmittance, low iron tempered glass with enhanced stiffness and impact resistance Advanced encapsulation material with multi-layer sheet lamination to provide long-life and enhanced cell performance Unique frame design with strong mechanical strength for greater than 50 lbs./2 ft. wind load and snow load withstanding and easy installation