Plasticoid Black Rubber Stoppers Solid 7-M290 Pack. Combining top-notch and uncompromising quality with an affordable price the Plasticoid Black Rubber Stoppers Solid 7-M290/ 59580-262 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: This high-quality laboratory stopper features a firm non-tacky surface excellent for setting up various pipettors. The top of the stopper is grooved for easy starting and the base has a lip that prevents the stopper from slipping off the tip. The top of the stopper is grooved for easy starting; however due to the material's consistency it is important that the tip is held firmly against the side wall of the pipette before the stopper is removed. A sizing key is included allowing the proper choice of size based on the size of the spout and/or the size of the receptacle. Specifications for Plasticoid Black Rubber Stoppers Solid 7-M290 : Size: 7 Dia. of Top mm: 37 Dia. of Bottom mm: 30 Length mm: 25 No./lb. (Approx.): 16 Unit: Pack (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Plasticoid products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Laboratory Consumables with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Plasticoid Laboratory Consumables. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the Plasticoid Black Rubber Stoppers Solid 7-M290/ 59580-262 we carry a full complement of Laboratory Consumables as well as other product offerings from Plasticoid. We also carry a full line of Plasticoid accessories to help meet your laboratory and scientific needs. For a complete selection of Plasticoid Laboratory Consumables please visit our Plasticoid page. For more brand name Laboratory Consumables please visit our Laboratory Consumables store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Plasticoid Black Rubber Stoppers Solid 7-M290 Pack