Castle strings- one of the more affordable sets out there. Please note the claim: Lite top, heavy bottom. We know that 9-42 is the standard gauge for this set so the 'heavy bottom' there is inaccurate.
Heavy bottom here would mean that the D/A/E strings will have to be thicker, an example of which is illustrated by Ernie Ball- 26/36/46. So my message to manufacturers out there: Check your claims.