Through Authenticate 
2. Material: EVA.ABS
3. WEIGHT: 610±10G
4. HARDNESS:
30°-35° (SOFT)
40°-45° (MEDIUM)30°-35° (SOFT)
60°-65° (HARD)
●FEATURE:
1. The flat blocks in the middle can help reduce lower back pain.
3. The both sides like fingertips which relaxes your body and increases blood flow, can do-it-yourself massage.
