I made these horns for my 5 year old daughter. You can attach the horns to the hair band with 4 screws. I used the screws of the light switch covers in my home. If you want to print larger horns for an adult then try printing at different scales. Note that the horns mist be printed at the same scale of the hair band in order for the screw holes to match up. Thanks for looking and have a happy Halloween! #CostumeChallenge