If we talk about flip placards, both our Flip-n-Lock Placards as well as DigiLock Placards feature a drainage channel in the base, unlike the ones commonly found with competitors. Rain and snow run right through the channel. Channel slots propel ice, dirt, grime, and salt away. Since there are two drain holes per side, sludge and ice build-up are hampered. Watch this amazing video to take a virtual tour of these placards.