This is the OMS Small Trim Weight Pocket 4lb Capacity

Features:

• Maximum weight is 5 lbs. (2.3kg)
• Mounts vertically or Horizontally
• Velcro Closure
• Heavy Duty 1000 Denier Nylon

Designed to be mounted on 2 inch webbing, vertically or horizontally. Can be used on nylon tank bands to augment the divers trim.