Hilarious gag gifts and pranks for adults and kids. These googly eye glasses blink when the wearer smiles and stop when they stop smiling. A fun novelty prank toy gift. One size fits most. The blinking eyeball glasses measure 15.8 x 6 cm. With two adjustable straps, they fit most adults and children. How to adjust the two straps: Step 1: There are three adjustable holes on the temples of the glasses. Choose a hole based on your face shape, thread the white strap through it, and tie it securely under the chin. Step 2: Thread the black cord through the hole at the end of each temple. Ensure correct attachment as shown in the image. Step 3: Make sure both straps are securely fastened. Smile or laugh, and the novelty glasses will blink. Ideal for festivals and carnivals. Great for costume parties, role-play events, beach parties, Halloween, Christmas, birthday parties, class events, graduations, bachelor parties, weddings, photo booths, and more—indoors or outdoors. Perfect party accessory. A great unisex gift. These colorful eye glasses make fun gifts for family, kids, couples, relatives, friends, classmates, coworkers, and roommates. Enjoy shared laughs and memorable moments.