Classification by size: usually 2 specifications: 130mm*120mm*60mm and 170MM*150MM*160MM

By shape: piano shape, heart shape, Mickey Mouse shape, guitar Shape, swan shape

By movement: Yunsheng movement, Japanese SANKYO genuine movement, Lemans movement, ordinary plastic movement.

Number of tones: 18 tones, 30 tones, 50 tones, 78 tones, 156 tones.

By color: pink, purple, blue, white, amber, black