SureCav 25 Cavity Spacer System 1200 x 450 x 25mm (L x W x T) is a polypropylene panel that is moulded and recycled, with spacer protrusions that form a 25mm clear cavity. This enables the construction of a slate, stone, flint and brick outer skin without the requirement of an additional block leaf. Clean and moisture free cavities are ensured by using this cavity protection system, making it ideal for use with traditional and timber frame construction. Mechanical offload should be used wherever possible. Individually packed in packs of 10, each pack weighing approx.. 13.5kg each. Please be advised that most orders over 100 sheets will normally come on a pallet for easy offload, these will be wrapped together.