This is one of those rare times of the year when the seasons of the 4 big saps: lychee, rambutan, pulasan, and longan overlap. At least for a few short days:
As you may notice from this photo, it's really a myth that pulasans are bigger than rambutans. Well yes, they are bigger on the outside, but they also have a much thicker rind, and usually a bigger seed. So they end up being the same in pulp content, or sometimes a bit less.