C4 Dyno Neck Weight - 4kgErgonomic design With an ergonomic and innovative design, Dyno has been conceived to improve the position and balance of the freediver. Material quality Dyno features a lead core overmoulded with a soft thermorubber material. This type of molding creates a perfectly uniform thermorubber coating, greatly improving resistance to ware and allowing for a perfect grip. Dyno, once worn, stays in place without any unwanted movement and abrasion on the