4 inch therapy ball good for release hip flexors, lower back & thigh muscles pain relief. Note 1, If you use it for other needs such as pilates,yoga or other exercise, please note that this ball is 4 inch

Easy to inflate with the needle pump, no need plug. Note 2, the ball you received in deflated status

4 in ball. About the size depends on the degree of inflation, it may between 4-5. you can refer the post pictures(the one with the scale), and the image upload by others. Note 3, If you have special requirements for the size, please check the size

Sturdy and thick ball, not soft. Please note it 50% thicker than the 8 inch or 9 inch ball. Note 4, If you are not especially looking for this kind of hard ball, it may be a little thick for you, not soft enough

Ball is not perfectly round, you can refer the picture uploaded by others. If you need it very round, you can take an electric air pumps(not included in the package). Note 5, most likely the ball you inflated, a bit like an ellipse

·4 inch therapy ball for release hip flexors, pain relief for lower back thigh muscles ·Hip hook release ball 4 in, pelvic floor massage ball, pelvic exercise tool for pain relief Pysical therapy: hip hook, pelvic floor, lower back, neck curve, between ankle, leg lift Materials: rubber,anti burstSize: 4 inch Color: Blue Package: 1 ball(in deflate status), 1 pump with needle Q1: Inflate with pump? A1: Yes, pump included Q2: Too hard to inflate? A2: Inflate like basketball or other sports ball, no mouth blowing, more easy to inlfate Q3: Cannot keep air? A3: without air plug, won’t loose air, keep air like soccer Q4: About the size A4: In deflate status 4 inch, you can inflate the degree depends on your needs