Eisco Premium Qualitative Filter Paper, 100 Pack - 7.28" (18.5Cm) Product Details High retentivity, perfect for general laboratory filtering and qualitative analysis 10 µL (micron) pore size Medium Speed (85 gsm) Pack of 100 circles Premium quality 18.5cm diameter filter paper for use in labs. Medium speed. Pore size: 10 µL. Pack of 100 circles. Premium Qualitative Filter Paper with a 18.5cm (7.28") diameter High retentivity, perfect for general laboratory filtering and qualitative analysis White in color, with a smooth finish Inspected for uniformity of texture Pack of 100 circles Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.