which come in packets of 50 pieces - those are clear on both sides. Another popular product is Cowan's Coin Holders which have a clear plastic circle surrounded by white cardboard on which collectors may write a brief description of the chip or its pricing. CT is a good source, also you can search for them on eBay or by a coin supply company on the internet. Price-per-holder will go down, of course, with the greater the quantity you wish to buy. As has been said before on this site, avoid holders made of PVC which can damage the chips inside.