The Eppendorf eptips - totally integrated pipetting system – satisfy the stringent requirements of dependability, reproducibility, and the trend towards smaller sample volumes. Optimized cone geometry allows for a perfect matching of every Eppendorf pipette tip to every Eppendorf pipette, for guaranteed pipette performance when used as a system. Additionally, the eptips are also universally applicable for use with pipettes from all other manufacturers. The eptips system provides an alternative to throwing away an entire box when the tips run out. The reload set enables contamination-free transfer of fresh tip trays into the reusable box used for loading your pipetting. To begin using this stem, order a set, which includes a reusable box and five trays of 96 tips (five trays of 24 tips for 18888-64). for one-time use tip boxes, order a rack. Pcr clean tips are certified human DNA-Free, DNase-Free, RNase-Free, and PCR inhibitor-free. Refill system and reduced ejection force requirement.