A little closer to the original question: Good CF 'play' shafts should have a wall thickness at 0.8 to 1.0mm. An 11.8mm CF shaft with 0.8mm wall, empty 8 to 10 inches behind the tip, can yield crazy low deflection, but so can a well made maple shaft in the same diameter, with a long 'pro' taper - so it can get 'whippy'. The CF break/jump shaft blanks that I finish for people are 1.2-1.3mm wall thickness and they are NOT low deflection. I always recommend brown linen phenolic as a break/jump tip and won't say that a Samsara break/jump tip is a bad choice, but it's certainly more expensive.