Plasticoid Black Rubber Stoppers Solid 15-M290 Each. Combining top-notch and uncompromising quality with an affordable price the Plasticoid Black Rubber Stoppers Solid 15-M290/ 59580-546 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: This solid black stopper is recommended for use with Plasticoid test tubes with "-ing" or "-ing" in the name. It is intended for use with test tubes that are "-ing" or "-ing" only. The "-ing" or "-ing" in the name refers to the "-ing" or "-ing" in the name or it may also refer to the color. The "-ing" or "stirring" in the name may occur in some cases because of the spherical threads. Some stoppers have slits or compartments in the neck while others have an irish hook. Solid stoppers are recommended for use with test tubes that are "-ing" or "ing" in the neck. Solid stoppers are most often used with test tubes that are "+ing" or "ing" in shape. Flexible stoppers must be cut to desired length. Specifications for Plasticoid Black Rubber Stoppers Solid 15-M290 : Size: 15 Dia. of Top mm: 103 Dia. of Bottom mm: 83 Length mm: 39 No./lb. (Approx.): - Unit: Each (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 15-M290/ 59580-546 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 15-M290 Each