Buy Disposable Filter Needles for less at Med Lab Supply. Filter needles feature a molded-in 5-micron filter membrane that reduces larger particles during fluid aspiration, reconstitution or transfer, and during medication withdraw from glass reservoirs. Needles are constructed from stainless steel, are sterile, non-toxic, and non-pyrogenic. Buy all your medical supplies at discount prices, no account necessary. Order Conveniently Online. Guaranteed Fast, Secure, and Discreet Delivery. Overnight shipping is available.