Sealed with silicon rubber to reduce noise when door closes Strong magnetic force Optional counterplate sold separately - Stainless Steel - MCJM49, AS-68 - Plastic Sealed - MC-JMP45 Screws not included: M4 truss screw recommendedWARNING: This product can expose you to 1,3-butadiene, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65WARNINGs.ca.gov.