What is the main characteristic of the Rockford Bump cocktail glass?

The Rockford Bump cocktail glass is primarily characterized as a martini glass. This type of glass is known for its distinctive shape, typically featuring a wide, shallow bowl with a long stem. The design of the martini glass enhances the aroma of the cocktail, allowing the drinker to enjoy the full bouquet of the spirits and ingredients.

Martini glasses are particularly suited for serving cocktails that are shaken or stirred with ice and then strained, such as martinis and other classic cocktails. This glass type emphasizes the visual appeal of the drink, which is an important factor in the cocktail experience. Its elegant shape contributes to feelings of sophistication and is a staple in many cocktail bars.

The other options listed do not reflect the main characteristics of the Rockford Bump cocktail glass. A mason jar is more rustic and often used for casual drinking, while highball and rocks glasses serve different types of drinks and have different shapes entirely, suited for mixed drinks and spirits served on the rocks, respectively.