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By certification 
1) Mahjong tiles
Specifications
Automatic mahjong table use
Positive magnetic tile
Only be used on Treyo brand mahjong tables
Product Description
1, Only be used on Treyo brand mahjong tables.
2. Also can be used by hand.
3. Positive magnetic tile.
4. Automatic mahjong table use.
Mahjong tiles size: 33MM,36MM,38MM,40MM,42MM,44MM,46MM.
