oxyCLONE oxyCERTS 1 7/8"oxyCERTS are soft, non toxic EVA foam plant inserts that are perfectly shaped and fitted for your oxyCLONE system. With their no pinch design, they hold delicate clones firmly yet gently throughout the entire propagation process. They are fungus and bacteria resistant, chemical and heat resistant, and writable. They will not absorb water, so there is absolutely no degradation or water logging. Cleaning is simplejust use warm, soapy water.