A pair of arms includes a first arm and a second arm, each having a curvilinear configuration. Each arm has a lower portion and an upper portion. A U-shaped vertex couples the lower end of the lower portion of the first arm and the lower end of the lower portion of the second arm. A first outwardly curved portion has an upper end and a lower end. The lower end of the first outwardly curved portion is coupled to the upper end of the lower portion of the first arm. A second outwardly curved portion has an upper end and a lower end. The lower end of the second outwardly curved portion is coupled to the upper end of the lower portion of the second arm. First and second knobs are at the upper ends of the first and second outwardly curved portions respectively.