Elevate your bridge game with these professional-grade bidding card holders. These bidding card holders are an essential accessory for any serious bridge player or club looking to enhance their game experience.The box are made of high quality ABS engineering plastic from Taiwan and the cards are printed on one kind of Indonesia imported pulp, which is none toxic and being an environmentally friendly product, 100% recycle. When closed, the boxes are flat and easy to stack for storing and transporting. Bidding boxes prevent any bidding errors/misunderstandings by giving a visual reminder of the previous bids and they keep noise to a minimum.The box is only 6x3x1 inch in dimension. The cards can be compactly stored in the box when not in use and the box can be closed tightly.