I love black and white tape for adding a contrast in my sketchbooks. Like the cavallini tapes, this one is semi trasparent and takes paint and dye over the top well - so you can blend it in to your page
20mm wide x 5m keys
set of two - 15mm and 30 mm x 5m featuring butterflies and sort of scientific bottly things - sorry best I can do for description .. look at the images!!