The sharp-edged lid jars are known as our high quality jars. High quality jars are made to prevent any leaks when closed. The jars are highly suggested for storing fine dip powders and liquids. Depending on the size, some of the high quality jars come with vacuum seal lids to prevent from messy spills. Other high quality jars will include a white foam liner instead of vacuum sealed lids to prevent them from leaking.