The curtain track rollers can be installed on curtain tracks/inner tracks and are suitable for curtains, door curtains, shower curtains, etc. Easy installation: the plastic curtain hooks gently into the curtain track; no tools are required. The white hooks complement various curtain styles for a simple and beautiful look. Made of high-quality plastic, these curtain track hooks are yet sturdy, quiet, and . Unlike metal hooks, they 't rust or stain your curtains. These curtain track hooks have a smooth and are equipped with flexible rollers, allowing them to glide smoothly and quietly along the curtain track for easy opening and closing of your curtains. Package: 120 silent rollers and 8 threaded rollers.