Hustler Toys Lace Up Back Vibrating Panty S/M. The Lace Up Back Vibrating Panty by Hustler Lingerie includes a powerful bullet vibrator that is discreetly hidden in the panty. Featuring a sophisticated black color, the hot pink lace in the back provides an eye catching touch of style! Enjoy this panty everywhere you go. Vibrating bullet requires 3 AG13/L44 batteries, included. Ladies sizes small to medium. Powerful, discreet and sexy.