THC range is the middle half of 4 public lab tests of 9 pound hammer flower (2022–2022). Source: Cannlytics lab results, CC BY 4.0.
9 pound hammer is a cross-bred hybrid. You may also see it sold as 9 lb hammer.
Public lab results give a good picture of its strength: 4 flower samples tested in 2022 came in at a median of 12.8% total THC (the middle half ranged from 9.5% to 17.6%). That is on the milder side for modern flower. Potency varies by grower and batch, so always check the label.