Designed for use with Weck canning jars, these flexible BPA Free lids will preserve the freshness of your foods - whether stored in the refrigerator or freezer. As the lids slightly expand, there is a lower chance of glass breakage as the contents of the jar expand upon freezing. - Small Lid #60 works on: WK080, WK755, WK760, WK761, WK762, WK763, WK764, WK766, WK902, WK905, WK975, WK995. - Medium Lid #80 works on: WK746, WK751, WK758, WK900, WK901, WK908, WK976. - Large Lid #100 works on: WK738, WK739, WK741, WK742, WK743, WK744, WK745, WK776, WK974. Brand: Einkochwelt® for Weck® Jars