16 Assorted Colors Marker (Fine Tip) Pen set - Ideal for Adult Coloring books, Class Work, Calligraphy, Sketching, etc. No leak, No Mess, Non toxic, Free how to build guide. Bulk Buy Offer. TyiranCo. UNIQUE COLORING PEN that has been specially designed for draw build and play. These can be joined to each other by either pushing them together or using connectors to build with, let your imagination run free & see what you can make! SMART marker pen has a 2.0mm bullet tip & non toxic water based washable ink that is available in 16 vibrant ink colors. CONNECTION by simply pressing together allowing you to create a multitude of wonderful patterns and colors. PRODUCES BRIGHT COLORFUL CLEAN LINES. They are ideal for writing on cards, sketching, graphics and design work. DESIGN When you get tired of drawing you can connect & build your own toys with Stix. The world is your oyster there is no end to what you can create. Stix can be joined together by simply pushing them together or using connectors.