0.2ml strip PCR tubes and flat caps, 250 strips/bag.Eight 0.2ml tubes with dual connectors between reaction tubes and caps for added strength. Thin-wall design provides maximum PCR efficiency. Easily cut for use as individual tubes.Optical flat cap strips feature ultra-clear upper surfaces, ideal for fluorescent or luminescent applications. Real time cap strips offer a light transmittance of 75% higher than with standard strip caps.