1. 12pcs/box 

2. High-quality spring steel Fully electrophoresis coated

3. For school, home, office use

4. Product Size :

15MM - 26x15x6.6mm

19MM -  33.5x19x7.5mm

25MM - 41.6x25x10.5mm

32MM - 52.1x32x13.5mm

41MM -  66.6x41x16.7mm

51MM-  82.3x50x22.3mm