50 x RFX RNA Saliva Collectors (Each containing funnel, tube filled with 1ml stabilisation buffer & instructions. Supplied with 2 x 22mg proteinase K, 1 x 5ml precipitation buffer & instruction booklet).The GeneFix RFX is an easy to use RNA saliva collection device that stabilizes RNA from the moment of collection for 4 weeks. GeneFix RNA Saliva Collector for 50 x 1ml Samples RNA Concentration in GeneFix and Alternative Collectors Over 22 Days Allows for Isolation of High Yield, High Purity RNA & DNA RNA Stabilized at Room Temperature for at Least 4 Weeks Economic, Easy to Use Integrated RNA Stabilization Buffer Compatible with Most Manual & HT