Gel Roller Fabric Pens 1.0mm-BluePENTEL ARTS-Fabric Gel Roller Pen. 1.0mm. Permanent waterproof acid free. bold 1.0mm tip produces smooth lines. No-smudge no smear ink is permanent on most fabric. Water based pigment withstands repeated washings even dry cleaning. These fabric markers are perfect for labeling clothing for schools camp and daycare. Autograph sports apparel and class T-shirts. Decorate hats shoes and other accessories. Conforms to ASTM D 4236.