Modular blocks are constructed from a solid anodized aluminum block. The close contact of tubes-to-block walls allow for maximum heat retention. The PCR Plate block has a thermometer well for measuring block temperature and is a double size block. Please note that the PCR Tube and PCR Strip blocks do not have a thermometer well and are single blocks. Tapered tube wells for 0.2mL tubes are spaced for easy access and removal.