Dimensions and Composition
97% hard lead, 3% polyvinyl chloride (PVC)
A small hole is systematically present in the PVC coating of the lead to allow air to escape during manufacture.
Dimensions (L x W x H): 9.5 x 9 x 2 cm
Slot: 5 x 0.8 cm
What influences ballasting?
1/ Your physiology (weight) and body mass index (weight/height).
2/ The water: seawater offers more buoyancy (you weigh more) than freshwater.
3/ Your wetsuit: depending on the thickness of the neoprene, you float more or less.
4/ The weight of your tank (for scuba diving) and the volume of air it contains: the more air you consume, the lighter your tank, and the more buoyant it becomes (you float!).
Brakes / Weight fix / Lead locks
Lead locks (also known as brakes or weight locks) are used to link your leads together: this prevents them from moving when you're in the water.