Features: 1. Automatically Squirrel-Proof: When a squirrel tries to climb the pole to eat the birds feed, the spring ring is designed to start extending under the weight of a squirrel to make the squirrel slide off the pole, while the spring action frightens it away without harm 2. Feed The Birds, Not The Squirrels Keeps squirrels on the ground and away from your birds feeder with Squirrels Trouble. Its unique spring mechanism deters them from gaining access to your birds feeders or birdhouses. 3. Easy to Install: It is an individually spring-loaded protection device that never needs adjusting, just attach the spring at the top of the support pole, it is ready to go straight to bounce the squirrel away. 4. Long-range Elasticity: Spring design, with high-elasticity to extend to enough length and keep a safe distance between birds feed and squirrels, which allows the birds to eat while preventing squirrels from getting a meal, providing a safe place for the birds. 5. No Harm: This product does not cause harm to animals. No harm to squirrels, just keep them away from birds feed. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Material: Metal Product Size: about 6 x 4 x 4cm includes: 1 x Squirrel-Proof Spring