QUICK INSTALLATION:These bird spikes require no assembly and are simple to install. Simply choose nails, screws, clips, or mounting glue as needed to secure and install on fences, roofs, sheds, window sills, and decks. AND LONG-LASTING:Our bird proof spikes are made of high quality acrylic plastic with high quality ABS material that is waterproof, climate proof, UV radiation proof and can be used all year round. FULL CATEGORY PROTECTION:Bird proof spikes not only protect against birds but also other critters including cats, squirrels raccoons. Continuously keep it clean and tidy. TAILORED TO FIT:Each bird spike can be divided into the size you want for convenience. Colour:Silver Material:Metal+Plastic Size: 25cm Package Contents: 40 x Bird Spikes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.