Child Resistant | Smooth Push Down & Turn Plastic PCR Caps for Glass Tube w/ Foam Liner | 20mm - Matte Black - 400 CountThe 20mm Smooth Push Down and Turn plastic caps have everything necessary to make a regular jar fit for storing and preserving goods. The sturdy build of the pcr caps is executed using a reliable plastic material. To guarantee product preservation, the cap is reinforced with a foam liner to make it leak proof and as airtight as possible. Furthermore, in terms of compliance, the push down and turn lock system on these lids have been tested and proven