1. Classification: ordinary permanent magnet door jams are divided into wall mounted type and floor mounted type according to the installation form, plastic type and metal type according to the material; electromagnetic door jams are divided into different types. Installation products are divided into three categories: wall type, ground type and chain type. According to different structures, wall type electromagnetic door stopper is divided into standard type, increased type, extended type, box type, concealed type and long arm type.

The ground type electromagnetic door stopper is composed of wall type electromagnetic door stopper and right angle ground mounting bracket; the chain type electromagnetic door stopper is composed of wall type electromagnetic door stopper and chain fastener; because the main bodies of wall type, ground type and chain type electromagnetic door stopper are common to each other, it is convenient for users to select according to the site installation conditions.

2. Material: most of the high-quality door jams are made of stainless steel. The door jams made of this material are durable and not easy to deform. When purchasing the door stopper products, we should pay special attention to the appearance and shape of the door stopper, the manufacturing technology and the toughness of the shock absorption spring, and try to buy products with compact shape, fine technology and high shock absorption toughness.