Premium material: Our magnetic tumbler lid is made of bpa free crystal clear plastic that is impact and shatter resistant. It stays crystal clear even after years of repeated use. You can use it with confidence. Magnetic Slider : The tumbler lid adapts the magnetic principle, the slider can be removed for easy cleaning. Always use the dishwasher, but never the microwave. Wide application: The tumbler replacement lid can be used for tea mugs, stainless steel mugs, coffee mugs, ceramic mugs, wine glasses, glasses, etc. They are also ideal for indoors and outdoors using, such as office, home, school, camping, etc.