Acrodisc Syringe Filter with Versapor Membrane 0.45um pore size. 4mm diameter. For cell cultures and other biological applications. Luer-Lok design. Large-pore Versapor acrylic copolymer membrane. Max 75psi. 88[degree]C maximum. Nonpyrogenic. Individually wrapped. Nonsterile. 250/pk 750/cs.