The ESV Zap Gel Instant Adhesive, packaged in a 0.70 oz (20 gm) tube, is a cyanoacrylate gel-type adhesive renowned for its effectiveness in affixing stony coral fragments to coral rock and various surfaces within aquariums. Unlike the hassle of mixing 2-part epoxy putties or worries about tank inhabitants being affected by leaching amine epoxy curing agents, Zap Gel offers a mess-free and safe solution. Boasting the highest purity level among cyanoacrylate adhesives, it is not diluted with low-cost resins, ensuring optimal performance and reliability.