Feature:<br />1.Adults to help students master the correct posture to hold a pen.<br />2.Apply to the pen， a ballpoint pen， etc.， can be properly installed.<br />3.Environmentally friendly soft material， comfortable， anti-fatigue.<br />4.Concerned about the children take a posture， the children started life in correct guidance.<br /><br />Specification:<br />Color:Pink，Blue，Yellow<br />Size: 8mm/0.31inch diameter hole<br />Sleeve: 3.4cm/1.33inch<br />Grip: 4.1cm/1.61inch<br />Fuction: Silver ion the bactericidal effect<br />Use: Wobi Correction<br />Material:Silicone material<br /><br />Package Included:<br />3 x Wobi Correction