This discounted magnet set has an inner (wet-side) magnet that slowly sinks instead of floating well. They resemble the standard  F-9 model, but they are stronger.

These Mighty Magnets are recommended for 2″ to 2-1/2″” aquarium wall thickness. The inner floating magnet dimensions are 5-1/2” x 8” x 2-5/8” thick. Uses pad set C/D, Dozer Pad D, Cutter bag D, and Scratch Removal Kit D.

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 Sets (C/D), Algae Cutter Bag (C), Dozer Pad (D), Scratch Removal Kit (D).

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