Absolutely ZERO RISK in buying something and trying it out

Does not hurt hair

Once the stake is put together

whose working principle is the temperature effect they provide

Detachable design: the middle screw can be unscrewed when removing the board

New Arrival - Multifunction Timing Plank Trainer ¡ì Absolutely ZERO RISK in buyingIt effectively activates your core muscles. FEATURE Preferred Material Provides more stable support and safe exercise, it also provides comfort for your arms, and makes you more "inclined" when doing plank exercises. Safe and Secure Angular mechanics triangle design, positive timing, countdown design, you can plan your exercise time reasonably, monitor in real time, and control the exercise time yourself. Comfort Grip TPE soft grip, comfortable foam