As far as origin, I can't really help you there. There's not too much info out there to be found on this particular line. I do know it's an older line of pastel so perhaps someone who's been in the game even longer than me would have some insight there.
But as far as temperament and size, they would be like any other Colombian BCI. The pastel trait is a polygenic trait most often associated with the common Colombian BCI. There are several "lines" of pastel: Kubsch, Cherry, Pastel Dream, Summit, and Ferrari are just a few. But this isn't a different type of boa - it is still a BCI. A pastel has a very clean pattern with reduced black. They usually have a bright wash of pink coloration as well - to varying degrees depending on the line.
Here are a few of my pastels to give you an idea....
Gin Fizz, 2012 Pastel Dream monstertail from Jeff Ronne, aka the Boaphile
Sangria, 2013 Cherry Pastel from Alex Burgos (not the best picture of HER, but the best one of her colors)
Henna, 2013 Cherry Pastel Jungle from Alex Burgos
Adult Summit Pastel owned by Alex Burgos
ALL of these snakes are Colombian BCI. They will vary a little in size, depending on adult growth and whether male or female, but they will all average 6-8 feet as adults and should all have very nice temperaments as adults - these are all very sweet kiddos.
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