Designed to be used where floor plates are not available or in a tournament setting for easy set up and transportEach base holds 800 lbs. of steel ballast to ensure they stay in place for playCan be used with most Spalding uprights without modification & can adapt to most 3 volleyball upright polesSystem includes: 36 Quick Set Net PackageAntennae Package Winch End Upright for Freestanding VB System Non-Winch End Upright for Freestanding VB System