Excel Scientific XTR-LG-100, eXTReme Sealing Films, Large Cut Ideal for PCR, qPCR, & Storage, 100 Films / Unit - 12-703 | Genesee Scientific Excel Scientific XTR-LG-100, eXTReme Sealing Films, Large Cut Ideal for PCR, qPCR, & Storage, 100 Films / Unit - 12-703 | Genesee Scientific