These 20oz Skinny Holographic Tumblers are crafted with durable stainless steel and feature a gorgeous, attention-grabbing design. They are ideal for hot and cold beverages and can keep your drinks at perfect temperatures. The tumblers come with a lid, and straw, and showcase the charm of handmade craftsmanship. For optimal care, we suggest washing by hand with soap and water. Avoid using a dishwasher to prolong the design's lifespan, and do not use a microwave. When exposed to light, holographic products display a full range of colors or a rainbow effect.