Aluminium. Anodized in color. Anodic oxidized. Sterilizable. For sterile but non-hermetic closing of vessels. With or without handle. Springs made of chromium-nickel-steel for clamping against the outer wall of the vessel.
Advantages: stainless, washable/reusable, heat-resistant, sterilizable, fixed locket, air supply is guaranteed, different colors for recognition.
1) After selling off no longer available