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2.WHATIS TENDON SHEATH. The tendon sheath is an inflammation formed by the junction of the tendon and shell on the hand, which is -bacterial inflammation.For a long time, the tendon is excessively friction here, and the tendon and tendon sheath can cause damage to the tendon and tendon sheath, causing discomfort. 1.SMOOTH ANTI-SLIP FIXING COMFORTABLE. Strengthen the entanglement to prevent slippingAfter tightening, it can give strong support to the wristband assist the force to stabilize the non -slip Feature 3.WHY FIXTHE THUMB. The tendon sheath is located at the root of the thumb and is a smooth liquid sheath to protect the tendon. Fixed the thumbs to restrict tendon and tendon sheath friction can solve the pain. After a period of fixing,the tendon sheath recover by itself.