Allsure® Calf of intra-ruminal, leaching boluses use unique and proven leaching technology to provide slow release supplementation of the 4 essential trace elements at known and optimum levels for approximately 6 months with a single application. The boluses are easily given to ruminant animals using a specially designed Animax applicator. The bolus enters the animal’s rumen/reticulum and lodges there and the trace elements leach out from the bolus at a known and safe rate. Spent boluses eventually become enlarged and are shed naturally.