This black solid rubber base was manufactured using a mold specifically created for the SICFS. The base centre measures 3 deep to accommodate the spring base for the indoor corner flags. Diameter of the base is 8.5 . Weight of the base is 2.6lbs so corner flags aren t easily knocked over. The advantage of this base over the EB68, is that you don t have to add water to it! The other advantage of these bases is that they can accommodate a pole with a diameter of 1 . (E.g. the J200A poles).