Blocking Materials

 is a decoration. It can be found in a Silver Enchanted Chest.

Trivia

 * The purchase cost was discounted to 10 during the Mother's Day Sale 2016 on 7th May 2016.
 * It was awarded as the fourth prize in the Shooting Stars Mini Event on 16th May 2016.
 * It was awarded as the fourth prize in the Wizard Training Mini Events.
 * lost it's premium status when it was added to the Silver Enchanted Chest with the Earth Day, Easter Update on 12th April 2017.