Made of stainless steel, plastic material, the pen ink spring converter is useful and . Simple and easy to use, perfect for liquid ink neatly and conveniently with your fountain pen. Excellent and useful, not easy to deform, you can use it with peace of mind. Features - Color: Silver, black, red. - Material: Stainless Steel, plastic. - Size: 12.00X0.70X0.70cm/4.72X0.28X0.28inch. - Manufactured with premium plastic and stainless steel material, and practical enough to use. - Comes with sufficient quantity pen ink spring filler, can easily meet your different needs. - Perfect and wonderful for school students, office worker, and other people they need to use pens. - Features portable and lightweight, they are convenient to carry and will not add to your burden. - The fountain pen ink spring converters are easy to refill ink, convenient and simple to operate. Package list: 4 x red pen ink spring fillers 4 x silver black pen ink spring fillers 4 x silver pen ink spring fillers