FOAM MATERIALThese Foam Pencil Grips are made of Nitrile Rubber, which is oil resistant, ageing resistant, and stable in air at 120, so the foam cushion material is quite durable, non-toxic. RELIEVE FATIGUEThese foam pen grips are soft enough to relieve your finger fatigue caused by long term handwriting works, and protect the health of your arthritis hands to easily grip pens . LIGHTEN THE PENThe pencil grips will insulate your finger from the pencil, increase the contact area of your fingers, and finally make it feel lighter and more flexible at your instructions. IP RESISTANCEEach pen grip has 10 grooves between the 11 rings, and the foam material absorbs sweat well, that will prevent the pen from ipping through your fingers. QUANTITY AND COLORSOur product contains 50 pcs with 10 colors. They will decorate your pencils, customize your handwriting with the various colors, and enhance your work experience, perfect for kids painting, children learning, and adults work. The size of the six coil pen covers is: length 3.5 * diameter 1.2cm, internal aperture: 0.7cm.Weight 0.001kg around each.