Professional quality ready-to-use block bait to be used in tamper resistant bait stations for the control of rats in and around buildings. Blocks contains denatonium benzoate, a highly bitter substance which helps prevent human consumption. Contains a unique chocolatey smell to encourage rats to investigate and consume bait. Roshield blocks are formulated using high quality culinary grade wheat flour, blended with chopped wheat, other cereals and proteins which are bound together by edible waxes. Purchase multiply packs depending on the size of the infestation. This Listing is for 4 packs of 300g Bromadiolone 15 x 20g blocks (total 60 blocks).