I really like this set of blades. They have the lead edge vertices "V" breakers, & spins quieter than other blades I've had. They also seam to spin at a lower start-up wind speed. These blades have a rounded ends. Where other blades are square cut tips, no lead edge "V" vertices breaker.& make noise. I'm thinking of buying another set, & replacing the blades on my other turbine. These are a well balanced set all with-in 1 gram of each other. Shipping time was great. Rusty