Thermo Fisher's yellow 0.2 mL flat-cap tubes are individual thin-walled PCR tubes designed for 0.2 mL thermal cycler blocks. Each tube is manufactured from virgin polypropylene and includes an integral snap-shut cap. The tubes hold up to 0.25 mL when capped. Their yellow colour provides a distinct visual marker for sample tracking. Cleanroom production helps keep the tubes free from contaminants that could affect experimental results. The product is supplied as two packs of 500 tubes. The thin-wall construction, virgin polypropylene material and integral flat cap are combined in each individual tube. The attached cap provides the stated snap-shut closure without a separate cap component. The 0.2 mL designation refers to thermal cycler-block compatibility, while the maximum capacity is 0.25 mL when closed. Yellow tubes and caps provide a consistent visual cue for keeping track of samples in PCR applications. The supplied quantity is 1,000 tubes in total, arranged as two packs.