Product Description Although it is not the original bio-sponge of Oase Biotec, but of high quality and manufactured with the same material comparing the real one. The unbranded polyester filter sponge mat. If you want to look for the filter sponge mat for the Oase Biotec filter system, please click on " honest-fly " to choose it in our store. Feature - Product dimension: 250mm x 250mm x 80mm - Generally designed and manufactured for Oase Biotec 5/10/30 filtration system. Warning points: Pay attention to the size column, you could find different kinds of product quality. You could get a better price if you buy more. About Transportation The great existence of deposit and the rapid expedition are our negligence. We will do our best to arrange each order within 24 hours, no matter it is big or small. We are the international seller, each object requires examined by two customs. DHL is the main way to transport, normally it costs 1-2 weeks to get to Spain. If you do not receive the object during the period or have problems, contact us first. Let's solve the problem for you. About us We are honest seller,if you have problems,please contact us first before leaving feeding. We will do our best to solve your problem.