SpectrumV™ Holographic Bird Gel™ is an easy, economical, and effective sensory bird control solution. Each easy-to-apply disc contains an innovative gel that uses a combination of sight, sense and smell that repels birds keeping them away from edges, ledges, and more! SpectrumV™ Holographic Bird Gel™ is used to deter sparrows, pigeons, gulls, crows, starlings, woodpeckers, and other bird species from buildings and structures. Sight - Holographic reflection technology creates visual hot spots that scares birds away. Sense - When touched, birds do not like the sticky sensation on their feet, encouraging them to leave the area. Smell - Proprietary blend of ingredients creates an aroma that is unpleasant to birds making this an instinctive bird repellent gel. SpectrumV Holographic Bird Gel is a true bird gel which is viscous in nature. In the off chance the gel within the dish happens to shift during transit, a quick and easy fix is to use the dish lid to spread the gel back into the dish. The movement of the gel does not compromise the effectiveness of the product.