Specifications:<br> Designed in tapered shape with standard demension, easy to plug in or pull out, creating an airtight seal in the mouth of your carboy or fermenter.<br> Well made with sturdy rubber stoppers to provide the best primary and fermenter arrangements possible, ideal for laboratory, household, and industrial use.<br> Smooth and tapered sides designed for exceptional sealing and optimal fit with a wide range of openings.<br> Various demensions to prevent oxygen from wreaking havoc with your fermenting process.<br> <br> Type: Test Tube Stopper Plugs<br> Material: Silicone<br> Features: Soft, Reusable, Easy to Use, Durable<br> Size 1:<br> Top Diameter: 13mm/0.51" (Approx.)<br> Bottom Diameter: 9mm/0.35" (Approx.)<br> Height: 27mm/1.06" (Approx.)<br> Size 2:<br> Top Diameter: 15mm/0.59" (Approx.)<br> Bottom Diameter: 11mm/0.43" (Approx.)<br> Height: 29mm/1.14" (Approx.)<br> Size 3:<br> Top Diameter: 17mm/0.66" (Approx.)<br> Bottom Diameter: 12mm/0.47" (Approx.)<br> Height: 32mm/1.26" (Approx.)<br> Size 4:<br> Top Diameter: 19mm/0.72"<br> Bottom Diameter: 15mm/0.59" (Approx.)<br> Height: 66mm/ 2.60" (Approx.)<br> Size 5:<br> Top Diameter: 22mm/0.86" (Approx.)<br> Bottom Diameter: 17mm/0.67" (Approx.)<br> Height: 36mm/1.42" (Approx.)<br> <br> Notes:<br> Due to the light and screen setting difference, the items color may be slightly different from the pictures.<br> Please allow slight dimension difference due to different manual measurement.<br> <br> Package Includes<br> 5 x Test Tube Stopper Plugs