11 inch Canner Rack: This rack is placed in the bottom of the canner to hold jars off the bottom of the unit while canning. It works for pressure canners which need 11 inch canning rack, such as Presto and All-American. Part of the compatible models have been listed in the description. Thickened Cotton Jars Mat: It is a double protection to use this cotton mat between the jars and racks when canning, which can reduce the vibration and heat for the jars in the boiling water. 4-Pack Canner Rack: 4-Pack Racks Create Two Layers for Canning More Jars, Save Time Effort and Money. 304 Stainless Steel Canner Rack: Strong Enough, Non-Deformation, Non-Discoloring, Non-Rust.Featured with Smooth Surface, which is healthy and easy to clean comparing to the aluminum one. Canning more in the canning season! Package Contents: 4 x 11" Canner Rack, 4 x Cotton Jars Mat.