I only have this one. The plastic baggie contains metal discs that have adhesive to attach to the bottom of the chalk. I found it not necessary to use the discs as the chalk fits in the holder fine without it. You may ask why am I selling it?...the experiment with the chalk did not go well. I'm a chalker and have been for over 50 years and couldn’t get used to not chalking after every shot. The chalk engages my brain lol. I will keep the chalk for my home table but it won’t leave the house.