This is a complimentary mineral feed for sheep over 40kg. It contains Copper Oxide, Cobalt, Iodine and Selenium. The boluses are designed to use a slow release leeching system that will slowly release the minerals over a six month period. These boluses can improve your flocks health, performance, vitality and reduce your concentrate use. The Allsure Sheep Bolus is perfect for use to meet the new sheep scheme mineral requirements.