Rupture Seal practice display unit. This 6" x 12" aluminum plate with a center hole not only displays the product, but allows customers to try by inserting the releasable practice unit into the hole in the plate. These units are NOT designed for actual deployment on anything other than water. DO NOT use on an actual spill because once the RuptureSeal™ is used on a chemical it now becomes a hazardous material and must be disposed of accordingly. The practice units will wear out after repeated use. You will get approximately 50 to 100 pulls before the practice unit has to be replaced. Sold as each.