Masontops makes it a snap to secure potentially dangerous items from curious children and nosy pets. They work just like your standard push down and twist child-proof caps on commercial pill bottles. Except they are custom designed to fit on regular mouth mason jars, which are transparent and large enough to accomodate a wide range of dry and organic food goods and various personal items. So it's easy to view the contents of your storage jars and know the items are difficult for small kids and pets to access. The silicone gaskets on the lids provide an airtight seal to keep strong odors of powerful herbs and spices locked inside while also preventing liquids from leaking out. Safely store everything from prescription drugs and other medications, pills and supplements to herbs, lighters, matches and even jewelry and keys! Your Jar Safe also includes a see-through tube (3.5" x 1.9") that easily attaches to the lid, so you can organize and separate delicate or small important items from the rest of the contents. It's just the kind of extra feature that makes all Masontops mason jar tools and accessories superior to the rest! And like all Masontops lids and accessories, they are made from premium quality food safe materials. They're made from durable and dishwasher safe BPA-free plastic and contain no phthalates.