The simple structure of these silicone stoppers makes them easy to use, whether you are a scientist or conducting experiments at home. Small size and lightweight design make these stoppers easy to transport and store, while their excellent sealing effect makes your experiments safe. Features -Color:White -Material:Silicone -Size:1.67X1.67X1.25cm/0.66X0.66X0.49in (S13.5) -Size:1.60X1.60X1.28cm/0.63X0.63X0.50in ( .5) -Size:2.00X2.00X1.40cm/0.79X0.79X0.55in ( ) -Size:1.64X1.64X1.27cm/0.64X0.64X0.50in ( ) -Size:1.55X1.55X1.23cm/0.61X0.61X0.48in (S8) -Size:0.75X0.55X0.55cm/0.29X0.22X0.22in (S2.7) -Solid silicone bottle stoppers made of reusable silicone, sturdy and durable for long term use. -Suitable for flowerpot, bottle, , flasks, test tubes or other laboratory applications. -The silicone plugs are of simple design, easy to insert and remove, giving you convenience and ease of use. -Compact and lightweight, these silicone stoppers are easy to store and transport, good for using in both home and laboratory settings. -Constructed from silicone material, these sealing stoppers are smooth, ensuring that they will not damage your bottles during use. Package list: 2 x S2.7mm stoppers 2 x S8mm stoppers 2 x S12mm stoppers 2 x .5mm stoppers 2 x S9mm stoppers 2 x S13.5mm stoppers