Each package contains 3 Standard ABS plastic scraper blades designed for acrylic tanks. For optimal cleaning performance, replace blades every 2-5 months.
Flipper Standard ABS Replacement Blades (for acrylic tanks). Flipper's patented design creates the only aquarium cleaner that can FLIP from scrubber to scraper simply by rotating the handle. Complete cleaning without ever getting your hands wet. It measures 3.5 x 1.5 inches; 0.3 ounces.
Blade Replacement Instructions: