Bird B Gone's Holographic Gel gives your ledges the most advanced bird repellent technology available. A combination of visual hotspots, repellent aromas and sticky surfaces deters a wide range of birds from multiple sensory angles. Simply place the adhesive dots across your surface (approximately 8 inches apart) for long-lasting, effective coverage. Please note, these are not to be used around legally protected bird species, in order to comply with the Federal Migratory Bird Treaty Act.