The copper core of enhanced insulators have larger size therefore strengthens the bondingbetween the core and the pc body. Enhanced insulators are perfect while being used vertically to bear the weight ofdevices installed below.Color Available: Red & YellowSizes available: (D x H Stud Size)30x30 M6, 50x50 M12, 40x40 M10, 60x40 M12, 40x50 M10, 60x60 M12, 50x40 M12, 60x51M12