The Big Cheese Ultra Power Block Bait Mouse Killer Station and Refills. Ready for use bait to be used tamper resistant bait stations for the control of mice indoors. Corner fit – two way entryClear inspection lid, see when the bait goes.Ultra power block bait includedBlock weight 20gContains 0.0025% w/w and denatonium benzoate 0.001% w/wRefill using The Big Cheese Ultra Power Block Bait