The 20-piece Faber Castell connector pens are sketch pens that clip together to form various patterns while facilitating easy storage. Colours are washable from most surfaces. Easy to store and hard to misplace. Keeps sketch pens from rolling off the desk. Special skin and grey colours. Contains free super connectors which helps in giving angles to the models. Medium point tip for good ink-flow. Click seal cap prevents drying. Broad barrel-big and easy to hold. Simply draw and colour or clip these pens together to construct interesting models Contains 40% more ink and lasts longer Child safe-food-grade ink