The Big Cheese Ultra Power Block Bait² refills include 15 x 20g ready-to-use bait blocks designed to target mice and rats in just one feed, providing fast-acting and effective poison. These versatile bait blocks are suitable for use indoors in homes or outdoors around structures such as garden sheds, outbuildings, garages, and greenhouses. Ideal for use with The Big Cheese Ultra Power Block Bait² Rodent Killer Kit (STV566, sold separately), these poison block baits must be used in a tamper-resistant bait station to comply with legal requirements. You can also use them to refill STV565 and STV566. The bait blocks contain brodifacoum for effective pest control. They are available in blue and come in a size of 15 x 20g, with dimensions of 12.5cm x 12cm x 12cm.