Material and construction Made from high-quality plastic, manufactured without air bubbles for consistent clarity and reliable walls. Each tube includes a screw cap / lid that seals tightly and is easy to open thanks to a soft cap design. Key benefits — why you need these tubes Secure, leak-proof storage: screw caps and tight lids prevent spills and contamination during transport and handling. Compatible with low-temperature centrifuges: suitable for use in refrigerated/low-temp centrifugation workflows. Durable and user-friendly: soft caps make removal and resealing simple while maintaining a secure seal. Versatile for lab use: small reagent/sample tubes designed for routine storage and processing. Important attributes Function: sample and reagent storage, centrifugation-ready for low-temperature applications. Compatibility: suitable for use in low-temperature centrifuges and routine molecular biology, biochemistry, and chemistry labs. Size/format: small plastic reagent/sample tubes with screw-cap lids. Performance: bubble-free molding for uniform quality, leak-resistant screw closures, soft caps for easy handling. Typical applications / use scenarios 1. Sample preparation and centrifugation: use these tubes to hold biological samples during low-temperature spins in molecular biology and biochemistry workflows. 2. Reagent and small-sample storage: store enzymes, buffers, small volumes of reagents or extracted nucleic acids in secure, leak-proof tubes for short- or medium-term use. 3. Field transport and routine lab handling: transport small samples or reagents between workstations or offsite while minimizing leakage and contamination risk. Practical notes Designed for routine laboratory use in molecular biology, biochemistry, chemistry and related fields. Screw caps are engineered for secure closure; soft cap material eases opening without compromising the seal. Manufactured without internal air bubbles to support consistent volume handling and reliable performance. These plastic reagent and centrifuge tubes combine secure screw-cap sealing, bubble-free construction and low-temperature centrifuge compatibility to meet common needs in molecular biology, biochemistry and chemistry labs.