Squirrels, raccoons and other climbing critters can't gain any headway when they try to climb over a Squirrel Slinky®. Use for pole-mounted bird feeders and nest boxes. Fitted with a high tensile spring, when weight is put on it, the Squirrel Slinky® lowers to the ground. As the critters move their weight from the Squirrel Slinky® to the pole above, the rod rises and pushes their paws off. Dimensions: 1.5 x 1.5 x 20 (assembled). Construction: Powder-coated aluminum with stainless steel spring.