... .Can recycle many times 5.ECO-Friendly Blackboard marker in heart shape by natural slate Stone NameJOYPlace of OriginJiangxi, China(Mainland ... )MaterialSlate, Marble, granite,sandstone,natural stoneShaperectangle, square, heart, round, ovale,etc.ColorBlack,rusty, grey,white,natural colorProduct ... contact us by Email or Fax.. Blackboard marker in heart shape by natural slate