10-pack; sterile and individually wrapped 25 mm diameter and 0.22 ç±³m pore size Polyethersulfone (PES) membrane features nice chemical and temperature resistance, accommodates solutions with a PH of 1-14, and provides fast flow rate, low protein binding, and low extractables Designed for fast, clean, and reliable filtration of small volumes; ideal for sterile filtration of protein solutions, tissue culture media, additives, buffers, water, non-aggressive aqueous solutions and biological fluid, and more Warranty: StonyLab 1-year limited warranty; if received damaged, please contact us immediately; we will solve it until satisfied