While odorless to humans, the non-toxic repellent inside these tamper-proof containers triggers the "flight" response, scaring deer away from your shrubs, flowers and vegetables. Just place on included metal stands and insert in the ground near plants you want to protect, or hang from shrubs and plantings. Weatherproof plastic container works rain or shine Protects bed plantings, shrubs, and vegetable gardens Tamper-proof, non-toxic formulation Effective for a full 3 to 4 months (no refilling required) Each container protects a 4 to 8 foot area Use included stakes or hang from loop on top Set of 6 2-5/8" diameter each Dark green color blends with foliage Metal stakes are approx. 24" H Active ingredient: dried blood