RoomCraft Set of 2 Dopamine Serotonin Throw Pillows 18x18 Square White Indoor-Outdoor Neurotransmitter Cushions One pair of RoomCraft Dopamine and Serotonin white indoor/outdoor throw pillows measuring approximately 18x18 inches each. Handmade in the USA. Pillow cover sizes are approximate. Only sold together. Prices are for a set of 2. Removable pillow covers make washing really easy. For optimal fullness we use slightly larger pillow cushion inserts. All pillow covers feature 3 quality wooden buttons and are suitable for outdoor use.