The silver mug has a stainless steel exterior and the black mug is enamel. The interior of both mugs is stainless steel. Each has three rows of rubber dots/grippers on the outside of the mugs for gripping.
The lids have sliding closures.
Both mugs are unused/brand new, standard sized mugs with no scratches.
Also included is a NIB "Lexus of Colorado Springs" key chain.