Handy Sign Post 54-in x 24-in White Vinyl Post Sleeve Sign, Planter or Mailbox Post Sleeve (sign, planter, flowers and mailbox not included) Maintenance free and durable PVC (Vinyl) with Lifetime Warranty Fits over existing or new wood 4x4 (actual 3.5"x3.5") post or many no-dig supports Accepts signs up to 18" horizontally and 45" vertically Simple to install