All cylinder bases require additional weight in the base when using to prevent the table from tipping over. OFS provides instruction sheets and clear 6 ml bags with base. Customer must provide dry sand for the additional weight. This base requires 30 lbs. for 42" round top, 96 lbs. for a 48" round top, 90 lbs. for a 42" square top, and 130 lbs, for a 48" square top.