Resistance bands vary in resistance, size, shape, handles, and looped vs non-looped.
Therapy resistance bands do not have handles. They have a flat surface rather than tubes and might come looped.
Tubed resistance bands consist of a tube and two plastic handles on each end.
Both types of bands come in different levels or resistance strength usually indicated by colors. The colors may vary by brand. The levels range from light, medium, heavy, very heavy. Choose the one that provides you with resistance, but doesn’t make you strain.