Low-density polyethylene (LDPE) makes these disposable pipettes with built-in bulbs the perfect substitute for breakable glass pipettes, eliminating cross-contamination and cumbersome rubber bulb changes. These one-piece syphons are particularly useful for all applications where the risk of infection or toxicity prohibits mouth pipetting. The plastic material is an excellent substitute for breakable glass pipettes. Narrow stem syphons have long, thin stems that are flexible and bendable to access narrow openings and small diameter tubes.