These 16 ounce reusable cup is a hard double walled durable plastic. Each cup comes with a clear screw lid & reusable straw! These double wall insulated tumblers have floating glitter between the two layers! The glitter settles towards the bottom & the glitter spins/floats when you shake them! Can be personalised with a name. Floating Glitter Snowglobe Skinny Tumbler With Straw