Leakproof, Good Sealing: these plastic vials with cap have O shaped silicone ring inside to prevent liquid from leaking, so that you can shake or transport these tubes with lids easily without worrying about leakage.
Leakproof, Good Sealing: these plastic vials with cap have O shaped silicone ring inside to prevent liquid from leaking, so that you can shake or transport these tubes with lids easily without worrying about leakage.