Para Blocks 1x3kgs Yellow And White Hollow Blocks 1x36pcsx50gms Urinal Screen Made In Malayisa Urinal deodorizer blocks (also called urinal cakes,para blocks,urinal mints Urinal screen,urinal pucks,urinal peons,urinal biscuits,urinal cookies,hockey pucks,or urinal donuts) are the small disinfectant blocks found in urinals. The purpose of these blocks is to disinfect, reduce odors, or mask odors of restroom urinals.