The Thunderhead Pro Series broadhead has been upgraded to make it the "best of the best". The nickel-plated point is 50% harder than stainless steel and won't rust. Micro-grooved ferrules tame the air turbulence for optimum arrow flight control and less surface contact for maximum penetration. The super sharp Diamondized blades are the most devastating blades on the market. Thunderhead Pro 85: 85 Grains, 3 Blades - .027" Thick, 1 1/8" Cutting Diameter. Thunderhead Pro 100: 100 Grains, 3 Blades - .027" Thick, 1 3/16" Cutting Diameter Thunderhead Pro 125: 125 Grains, 3 Blades - .027" Thick, 1 3/16" Cutting Diameter Come in package of 6.