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This is the fully functional prototype edition of Sleeve-O, intended for use as a flying toy and or cup stabilizer when used in conjunction with a cardboard coffee cup sleeve. Remove the cardboard sleeve, slip Sleeve-O onto the narrow end, pick it up like a can and throw Sleeve-O like a football! You can also slip Sleeve-O, along with the cardboard sleeve, back onto your cup to increase stability of your drink in your vehicle or on your desk. The 13oz model is slightly more stable indoors. See more at facebook.com/sleeveo