Corkcicle x Harry Potter Stemless Cup 12oz with Slytherin Dark Mark Corkcicle Harry Potter Stemless Tumbler featuring the Dark Mark symbol, which is associated with Slytherin House and Lord Voldemort in the Harry Potter series.  Here's some information about this product: • Design: This particular tumbler features the Dark Mark, a skull with a snake emerging from its mouth, symbolizing allegiance to Lord Voldemort. 
 • Insulation: Corkcicle stemless tumblers are known for their triple-insulated stainless steel construction, designed to keep beverages cold for up to 9 hours or hot for up to 3 hours. 
 • Features: Include a clear, shatter-resistant lid with a built-in slider and a slip-resistant silicone bottom.