This magnet set  is discounted because the inner floating magnet (wet-side) has neutral buoyancy in fresh water and floats slowly in salt water. Recommended for 2-1/4″ to 3″ aquarium wall thickness.  Dimensions are 5-1/2″ x 8″ x 3″ thick.

Product includes: Plastic Storage Case, Spacer Block, Instructions, and an extra Acrylic Safe Pad Set (outer magnet Felt Pad and inner magnet Algae Scrub Pad).

This product is compatible with: Replacement Pad Set (D/D), Algae Cutter Bag (D), Dozer Pad (D), Scratch Removal Kit (D).

Always clean, inspect, and test products in an inconspicuous area of the aquarium.