Vinyl Slats; Plastic Headrail Please note: This window blind is 37.5" wide to allow for mounting the blind inside a 38" wide window. Each blind will be 1/2-INCH NARROWER than the width ordered to fit inside the window frame. Sizes stated within the product descriptions are listed by width then height. See measuring instructions to ensure best fit. Measuring Instructions: To determine the width for vinyl blinds for indoor windows, measure your window horizontally in three places from outside edge to edge of the window frame: top, middle, and bottom. Record the narrowest measurement. For best fit, find the size with a width closest to your measurement. The size you order will come with a 1/2-inch deduction to ensure it fits in your windowsill properly. The height will be the longest measurement from top to bottom and will be the size to order. Blinds for Indoor Windows: This blind is suitable for inside and outside mounting of a window frame. Inside mount means completely installing the blind inside the window frame. The window frame needs to be at least 1 inches deep to install as a partial inside mount. Cordless Design: The cordless vinyl window shade enhances safety for homes with kids and pets while maintaining a sleek and modern appearance. Ideal for your window blinds for home, door blinds, and camper blinds. Includes Hardware & Instructions: Vinyl mini blinds add style and privacy to your home. Durable and affordable, they fit living rooms, bedrooms, kitchens, and offices. Ideal for home, door, camper, and RV blinds. Includes instructions and hardware for inside or outside mounting. Durable Materials: The 1 Inch Cordless Vinyl Mini Blind is made of durable materials and features light filtering PVC slats to provide privacy, block out light and add style to your home decor. A blind longer than your recorded measurement will work as the blind can be stopped at any position within the window frame.