BuyMagnets.com offers u-shaped grade 2 alnico magnets with a round cutout design in four different varieties. Holding strengths on these magnets range from .875lbs to 1.563lbs. All of these magnets are lightweight and compact. Since they are made of heat-resistant alnico material, each of these round cutout magnets have a maximum operating temperature of 1000 °F. The u-shaped design facilitates increased magnetic strength.