STABILO Trio Thick Colouring Pencils. Pack of 24 Colouring Pencils from STABILO. The Trio Thick colouring pencils include a triangular shaped barrel that teaches children how to hold writing instruments correctly. Featuring a 4.2mm lead these pencils provide rich colour application perfect for drawing and colouring. Smooth consistent, easy to blend colours, brilliant for any aspiring artist. Easy to sharpen and each pencil features break resistant leads perfect for children. This set contains 24 bright colours. Wooden cased thick colouring pencil with triangular design, particularly suitable for young children. Rich colours generate enthusiasm for drawing and colouring from a young age. Lead diameter 4.2mm This pack contains 24 Assorted Colours.