"THERMWELL" CSA ROOF & GUTTER DE-ICING CABLE * ADKS cable * Provides uninterrupted path for melting water, prevents water and ice damage to roofs * Roof edge, gutters and downspouts stay ice-free even in below zero temperatures * Shingle clips and cable spacers included * Easy-to-follow installation instructions * 7 watts per foot, 120 VAC * Insulated and grounded * Boxed * Length : 30" * Watt : 210