The first choke is a Negative = Bigger than cylinder Second choke is a Skeet = SK Third choke is a Modified = M = Mod The fourth choke is a Improved Mod = IM The fith choke is a Full = F The black one is Mod. Boehler
You have made things a little confusing if you read this post and it is the reason I asked the question,what is the black choke. You clearly state that the black choke is Mod. And we now know it is IMod. And the third choke is not Mod as you state it is Light Mod. No need to get pissy with anyone when you are trying to sell chokes and have made the buying process confusing. Just clear it up so we all know what is for sale. Good luck as these are great chokes.