The glue formulas in Catchmaster glue traps are effective for at least one (1) year in a home scenario, and for five (5) years unopened in a warehouse locale, giving you more value for your hard earned money. Catchmaster glue boards do not have oil in them like the competitions products use. Oil mixes with the body chemistry of the rodent and allows the rodent to escape. Oil also makes glue more susceptible to running or dripping in hot temperatures.