... :13.28*10.94*42.8MM color are avalibale silicone pen cap/pen casesize: 13.28*10.94*42.8±0.01mmhardness ... color: pink , yellow, blue, green...1)made of high grade silicone, not-toxic,Eco-frinedly,passed the RHOS test and SGS ... are available.4)customize's design or samples are welcome. silicone pen cap