Sold in bags of 50. It is recommended to fix each panel with 5 washers. Purchasing these special rubber-seal washers will enable the installer to fix the whole wall with SureCav to the timber-frame ahead of constructing the outer leaf. Additionally, if extra wall ties are required to support random stonework then an additional tie can be fixed using the washer. 

Wall ties are not supplied and are shown for illustrative purposes only. Standard stainless steel wall ties should be used that are approved by your Local Authority Building Control.