Features:
1) Versatility – Perform a Wide Variety of Exercises
2) Provide Back Relief & Chiropractic Support
3) Complete w/Solid Steel Frame & Safety -Locking Mechanism
4) Thick, Comfortable Foam to Protect Your Legs & Ankles

Specification:
1.Material: High Qulity Soft eva Foam Pad + adamantine metal plate
2. Color: Black 
3. Size: One standard size
4. Dia: about 12 cm
5. Weight: 3kg/pair

Package include:
1 pair abdominal Training Gravity Boots