The merits of the screw mark stick are:

1 Easy usage
2 No harm for animal skin
3 Environmental product
4 Last for long time
5 Visible for marking 

6 Fast dry 

Animal Mark Spray is ideal for marking all animals, such as pigs, sheep, cattle, horse etc., and  it  is designed to mark a long  lasting, highly visible mark on cattle, swine ,sheep, pig, horse or any livestock.

Extremely fast drying, resists fading.Once dry,is fully weatherproof and waterproof .Animal mark spray is available in a choice of colors, red, blue, green and purple, also can adjust the color per customers' requirement.