Product parameters Name: Multi-walled carbon nanotubes Purity: >95wt% Inner diameter: 3-5nm Outer diameter: 8-15nm Length: 3-12μm Specific surface area: >233m2/g Density: 0.15g/cm3 Actual density: 2.1g/cm3 Resistivity: 1412μΩm Preparation method: CVD Appearance: black powder Package: 30G Multi-walled carbon nanotubes powder Payment Policies: 1. We accept Paypal only. 2. All payment should be completed within 7 business days after sale end. Shipping Policies: 1.Item prossing time. We will dispatch the products within 1-3 working days upon the system confirms your payment,when buyers have some special request ,we will delay to ship the orders and will inform buyers about it. 2.shipping methods Items are shipped out via China Post Ordinary Small Packet Plus or eDS Hongkong surface mail or Normal Shanghai Surface mail or DHL globe mail . 3.Delivery time: United States and Europe normally takes 7-35 business days , other Countries normally takes 15-60 business days ,delivery time upon purchase location . Return & Warranty 1) 1 year warranty provided by manufacturer. 2) Missing item or get wrong item or Get damaged items, DOA (dead on arrival) When you (buyer) get the package, if you find there are some items missing from your order or we sent you incorrect items or you find the item is damaged (cracked) in appearance or the item does not work (DOA), please keep all the items in original condition and also keep the packing stuff, weigh all the items together with packing, then take some photos of them and send us the photos by email. Please contact us within 7 days after receipt of package. We will investigate the case when we get your email. If the case is true, we will send you the missing item or replacement or refund (sometimes you may be requested to return the incorrect item). 3)If you are not happy for any reason with your purchase or you purchased the wrong item , If the return is not a result of our error, customers will be required to cover shipping cost both ways . 4)all returned merchandise must be in original factory condition (including the original packaging and everything). 5) all items must be returned within 30days of purchasing the item , 6) For the replacement, we will send it out in the shipment ways as the customer selected in their original order.