One YoyoJam New Breed Axle. Note from Pete: this fits the OLD model New Breed and Atmosphere. Yoyojam later upgraded the New Breed and atmosphere designs to use axle part number AXL-6.
YYJ Part# AXL-2
The size is approx 6/32 X 3/8. It fits the old model New Breed and Atmosphere yo-yo. Not used in any current Yoyojam models.