Durable EnGuardV, modified PVC coated fabric reinforced with radio frequency-welded, high visibility yellow runway strips that withstand drive-thru traffic, including backhoes and skid steers. Removable 4 in (102-mm) diameter foam inserts support sidewalls while 2 in H x 8 in W (51 x 203-mm) planks (not included) slide into pockets to keep end walls elevated preventing wastewater from escaping during drive-over. Simply remove foam inserts to fold material for quick and compact storage. Two 1 in NPT fittings on each side of the berm for drainage. Brass grommets around perimeter provide the ability to securely anchor berm during use. Anchor stakes not included.