ZSP, or Zero Sole Pressure / McKinley Shoe liners are used for gluing racing plates with acrylic two part glues.  The liners are made of a soft rubber compound that can easily be fit into the inside of the shoe to hold the adhesives at the white line and prevent it from flowing into the sole area.  They are VERY sticky so they are a great help with the initial placement of glue-on shoes and they also keep the shoe level during curing time.
 
 The neoprene shoe liners are 9 1/2 inch long x 1/2 inches wide and a box contains 20 strips.