CAL-JUNE 4403-7-3 HARDSHELL MOORING BUOY.OVERSIZE! This item exceeds standard freight size limits. Additional shipping charges may be applied to your order at time of shipment. The Jim Buoy Premium Mark V mooring buoy utilizes one of the toughest plastics available today....CJ-37. This fantastic plastic provides a Rock Hard shell that is absolutely seamless and almost indestuctible! The core is 3 lbs high density polyurethane foam. 2" or 3" center tube for chain. The 2" tube uses 1/2" chain max. The 2.5" AND 3" tube uses 5/8" chain max. The buoyancy is 196 lbs.