The band loops come in 2 levels,
Blue (1mm, thick easier)
and Black (1.2mm thick, harder)
StudioXphys Resistance Band Loops are continuous 25cm wide loop elastic bands used for a variety of applications, particularly lower body Exercise to increase strength and balance. The band loops are an effective and efficient way to strengthen muscles and have the added benefits of convenience, portability, and eliminates the need to tie traditional bands, thus prolonging life and reducing additional wear.