500ul K3 EDTA Micro500 Blood Tube, Purple Cap. SAI's Micro500 blood sampling tubes replicate the dimensions of the discontinued BD Microtainer for 500ul blood collections. With the same slim 8 mm X 43 mm size, no adjustments for methods or instrumentation are required. 100/pack. Product is for laboratory animal research only. ** If a COA is required it must be requested when the order is placed or a $50.00 fee will be apply. Contact Thermo Fisher Customer Service at 800-766-7000 to request to COA. **