Features: Smartgrip Technology- Patented SmartGrip technology makes it hard to tip but easy to lift, Double-Wall Vacuum Insulation- Keeps your drinks cold until the last sip, Stainless Steel- Made with high-grade stainless steel, making them puncture & rust-resistant, Rubber Locking Gasket- Removable rubber gasket to securely lock in your can. These only fit standard seltzer or slim beer cans.