This cute POWER COUPLE Color-Changing His & Her's Ceramic Mug Set is perfect for couples who like to drink together and just want to express their love. After adding hot water above 140 Degrees Fahrenheit, the background color of the cup becomes white. The mugs have heat resistance to prevent your hands from being scalded. Highlighting the gender symbols, this mug set is a lovely gift for your spouse's birthday, ideal for your loved one's wedding, anniversary or Valentine's Day. The set is durable, dishwasher and microwave safe, making them the best choice for enjoying hot or cold beverages.