Peel and Stick-On Hook Sticks onto any smooth surface Does not work on rubber, silicon or soft matte  Hangs up to 5 accessories Single use adhesive Hand or Machine Wash How Does It Work?  Apply your Stick-On Hook onto the surface you want to accessorize Attach your Charm(s) onto the hook (up to 5 at once) FAQs: WORKS ON ALL WATER BOTTLES EXCEPT: Soft Matte Stanley Studded Tumblers Rubber, Silicon, Leather, Fabric, Wood textures Best materials: Plastic, Metal, Acrylic, Glass We've successfully tested CharCharms on Stanley, Hydroflask, Owala, Yeti, Contigo, Starbucks, Camelbak, Hydrapeak, Fifty/Fifty, Brumate, Swig, Swell, Frank Green, Larq, HyrdroJug Corkickle & more!