Retro, like Flashback, isn't a popular 80s slang term, but something about this peachy orange to gold colorshifter named itself. 
 
Unsure about sizing? Both a half and a quarter pan are pictured with the swatches in the second photo. There's a complete sizing guide included in the product photos. The following is a list of volumes:
Sizing information per pan:
Quarter Pan: 1mL 
Half Pan: 2mL
Round Pan: 2.5mL
Full Pan: 4mL 
 
See photo for a visual and measurements. 
 
PREORDER INFORMATION (if applicable): Preorders are open for 1 week and material sourcing/paint production doesn't begin until the preorder closes. Keep in mind that since these are made to order, the processing time is upwards of 1 month.