Excel Scientific TSA-100, ThermalSeal A PCR Sealing Film, Non-Sterile 50µm Film for PCR, 100 Films/Unit - 12-538 | Genesee Scientific Excel Scientific TSA-100, ThermalSeal A PCR Sealing Film, Non-Sterile 50µm Film for PCR, 100 Films/Unit - 12-538 | Genesee Scientific