Terra-Tabs allow for perfect spacing between paver joints and allow for expansion, air circulation, drainage and precise paver alignment. Terra-Tabs are made out of rubber and used in conjunction with Terra-Stand pedestals and Waffle Reducers. It can be used by itself when no elevation or leveling is needed. The use of Terra-Tabs is optional with the Roof Deck Pedestal System. Available in the following sizes: #5 - 3/8" thick, 5" sq, 3/16" wide spacer #5a - 3/8" thick. 5" sq, 1/8" wide spacer