✓ Sleepy Time Tracks is the original inventor of side tracks for light blocking shades, designed to enhance the effectiveness of your blackout shades. These innovative side tracks seal the gaps along the sides of your shades, preventing light from entering and ensuring your room stays significantly darker. Enjoy a peaceful and uninterrupted sleep with this simple yet effective solution. (Note: Shades are sold separately.) ✓ Detachable Side Tracks: These innovative light-blocking strips feature magnetic attachments, making them easy to remove and reattach as needed. This design is especially convenient for tilt-in windows, allowing effortless cleaning or screen removal without compromising on light-blocking effectiveness. ✓ Patented Light-Blocking Gasket - Our light block strips feature a unique patented gasket that creates a complete seal around your room darkening shades and eliminating those pesky slivers of light that seep through gaps where your walls might be uneven. ✓ Easy to Cut and Customize - No need to take out the hack saw to cut our window light blocker. These side tracks for window shades are designed to be easily trimmed with utility scissors and tin snips, saving time and effort. ✓ No Window Left Behind - Our light blocking shades come in 3 convenient lengths to perfectly fit several window sizes. Whether you have standard windows, a large picture window, or something in between, we've got you covered. We recommend using small screws to attach the tracks on a stucco wall! NOTE: For inside mounts you MUST HAVE at least 5/16 gaps (thickness of a standard size pencil) along each side of your shade for the tracks to fit.