Stonylab Nylon Membrane Filters, Hydrophilic Nylon Membrane Disc Filters With Description StonyLab engages in providing premium products to customers. We provide 12 months limited warranty and promise for excellent customer service. Please do not hesitate to contact us for any questions or concerns. We are always here to assist. Product Features StonyLab nylon membrane filters are ideal to use in chromatography and a wide range of biological preparations to retain particles, filter samples, vacuum degassing, and more; suitable for aqueous, HPLC, and most organic solvent 50-pack 3.7 inches diameter and 0.45 ?m pore size Nylon membrane is hydrophilic and has high protein binding as well as great chemical resistance Warranty: StonyLab 1-year limited warranty; if received damaged, please contact us immediately; we will solve it until satisfied Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!