For our Flashing Yard Glasses you’ll have high regard. They hold 17 ounces, but they’re not really a yard. They’re made of good plastic that is always food grade. They come in assorted packs of Red, Blue, Yellow and Jade. To activate the Flashing 17oz Yard Glass simply slide the switch on the bottom of the base to ON. This product has a battery saving feature; when you set the item down on a flat surface the flashing LEDs stop. To activate the LEDs while the switch is ON just lift the glass from the flat surface. NOTE: Each Light Up Yard Glass comes with a straw and straw cap. If you enter a 1 in the quantity box then you are buying one single glass so whatever number you enter is exactly how many individual glasses you’ll recieve. Height: 13.0 in. , 33.02 cm. – Volume:17 oz filled to brim – LED Colors: Red Yard Drink: 4 Red, 2 Purple – Blue Yard Drink: 2 Red, 2 Jade, 2 Blue – Jade Yard Drink: 4 Jade, 2 Red – Yellow Yard Drink: 4 Jade, 2 Red – 3 replaceable AG13 Batteries included and installed.