Cello Writing Instruments & Containers Pvt Ltd supplies Designer Ball Pen with SolidÿPlastic Clip. Cello Writing Instruments & Containers Pvt Ltd offers various types of gel ink pens. Designer Ball Pen with SolidÿPlastic Clip is available under the brand name-Optima, used by school kid, college student, young professional, senior executive etc. This Designer Ball Pen is available in black and blue color.