Bark Cork Stopper, Size 00

This pack of 10 natural bark cork stoppers is size No. 00, measuring 5mm at the bottom, 8mm at the top, and 13mm in length. The tapered profile provides a secure friction fit in small-bore tubes, vials, and flasks with matching neck diameters. Natural bark cork is compressible, chemically inert to most common laboratory reagents, and easy to bore for inserting fine glass tubing or thermometer probes. These are among the smallest standard stopper sizes, suited for micro-scale apparatus and small test tubes.