EV2 is a high quality 3D printed butterfly trainer that is perfect for the person wanting to get into flipping. Even a seasoned flipper will enjoy this hobby grade trainer. Both run on T-10 Torx pivots as well as brass washers to ensure smooth flipping. Lots of durability testing has been done and EV2 will hold up to regular use and lots of tricks. EV2 is slightly blade bias weighing in at 88 grams or 3.2 ounces. (Ev2 blade pin can be removed for more neutral flipping) Whether you want to learn how to flip or just want a super fun fidget toy, these are the trainers for you.