The Custom Flow Resistor Kit is designed for use with the Pressure-based Droplet Starter Kit. With the tools provided, flow resistors of the required length can be made. This enables the user to set the desired flow rate ratio between the organic phase and the aqueous phase without independent pressure control of each phase. The additional benefit of flow resistors is that they maximize the flow rate range of the Mitos P-Pump and prevent flow rate instability when using fluids of different viscosities. The kit also contains high tolerance FEP tubing with 100µm microbore and the required fittings to connect into the droplet system.