Anti-collision bird stickers can prevent birds and people from attacking. Made of PVC to prevent your furry flying friends from bumping into the photo window! Easy to install and stick on /doors. Tear, paste, and finish! We suggest sticking the decal outside the window, but if you can't reach the dangerous place outside the window, you can inside, and the effect may have some impact. Reduce your furry friends' accidents and prevent damage. It is a self-adhesive backing suitable for smooth glass doors and . Colour:transparent Material:PVC Size: 22 x 30cm Package Contents: 16 x Warning sticker 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.