Yellow caps are $40 strikes and contain between 1.25 and 1.5 ozt. of silver. Red and Blue caps are both worth $10 at the cage, but are worth significantly more on the "secondary" market. Blue caps (colorized clad, no silver) are worth between $20 and $25 or more in trade value. Red caps (.999 silver) are worth between $30 and $35 in trade value. Blue/Red/Yellow caps also vary in price according to scarcity. Prior to 2009, almost every casino or cruise ship had them. In 2009, when the machines were taken out, there were some strikes that were not "fully distributed" (all 500 were not distributed and the remaining were destroyed). One such is "The Playing Field" at Planet Hollywood. It is almost never seen for sale on the secondary market and when it is, typically sells for $150 or more. I have two, one bought from eBay and one bought when a collector sold off his collection. Yellow caps are only a recent introduction at QQQQ (one of the only two casinos to have Silver Strikes, the other is the El Cortez) Their secondary market value is between $70 and $100.