The holographic strands of the 51 inch long Silver Rainbow Windsock move in the slightest breeze creating a cascading effect with color and light. This dazzling waterfall of color is perfect for garden decorations, attracting hummingbirds and butterflies. They make great party decorations that liven any backyard party. Not only are Rainbow Windsocks delightful to look at, the constant motion of the holographic strands keep birds and deer away. Use them as bird deterrents in front of windows to prevent bird deaths.