The Canon WW-DC1 is a weight for underwater photography waterproof camera cases, providing stable shooting. - Model: WW-DC1 - Brand: Canon - Included items: Instruction manual, 4 plates, fixing screws All included items are present. Two of the four plates are unused. Waterproof Case Weight WW-DC1 Product Details ■ This is a weight (sinker) to prevent the case from floating when shooting underwater using a Canon waterproof case. ■ Includes 4 weights, plastic pins, and mounting screws. ■ Attach the required number of weights with the plastic pins, pass the weight mounting screw through the tripod screw hole, and attach it to the waterproof case.