Polypropylene thin wall tubes provide rapid, even heat transfer for reliable amplifications. Manufactured in the USA in clean room conditions and certified free of detectable levels of DNase, RNase, DNA, and PCR inhibitors. Tested pyrogen free. Order caps separately or seal with mats. Strips of 8 tubes have 125 strips of tubes (960 tubes) per pack. Strips of 12 tubes have 80 strips of tubes (960 tubes) per pack. Assorted colors include blue, green, red, violet, and yellow.