All pieces are a great addition to any Magnetic tile set All pieces are compatible to any major brand. All pieces are super safe all magnets are tightly closed glued welded in and riveted. Manufacturered by Magnetic Stick N Stack. Great for homes or schools hours of play and imagination. Made of top quality safety tested and makes a great gift. You are getting 2 6x6 HUGE domes 8 3x3 domes 12 arch pieces 4 tunnels 4 rounded windows.