These versatile reusable foam plugs are designed for use with test tubes and laboratory flasks Made from economical open-cell foam with a uniform density of 1 45 lb they offer a snug yet breathable fit ensuring free airflow while preventing contamination Unlike traditional cotton plugs these foam plugs leave no clinging fibers and spring back to their original shape even after repeated use making them a durable and cost-effective choice Perfect for Drosophila vials and a wide range of lab applications these foam plugs can also serve as cleaners for lab pipettes tubes vials and industrial precision tubing They can be easily labeled for quick identification enhancing lab efficiency and organization Reusable and Durable Maintain shape after repeated use Breathable and Non-Absorbent Ideal for maintaining airflow without moisture retention Autoclavable Safe for use in sterile environments Chemical Resistant Compatible with various laboratory chemicals Wide Temperature Range Perfor