Facilitate removal of stubborn jar and bottle lids. Simply place nonslip plastic sheet or dome on lid, grasp tightly and twist. Sheet diameter is 5-1/2". Dome measures 2" high and 4-1/2" in diameter. Both are 1/8" thick. Latex free. New Antimicrobial additive: Biomaster is a silver based antimicrobial additive which protects against the growth of unwanted microbes on the non-slip surface which may cause discoloration, degredation and mal-odors. Dycem non-slip incorporating Biomaster Protection have been tested to ISO 22196:2011 standards.