Use these silicone stoppers to seal test tubes! These stoppers come in a convenient pack of 100 – perfect for kitting out or replenishing your school’s laboratory.
Silicone is known for its durability, meaning that these test tube stoppers will last for a long time even with regular exposure to chemicals.
 
 
Measurements
Top diameter: 15mm
Base diameter: 10mm
Height: 16mm
 
Suitable for use with test tubes with a 12mm diameter.