I used 8ply cotton…and a 3:50mm hook, but you could use whatever size you wish. Looking back now…..i should have tried a chunky yarn. So if you do; let me know how you go and share a photo if you wish. The bobble is done with half Treble. i push mine to poke out the front) bobble stitch - There are a lot of video tutorials on the web. Ask me any questions if you need help and i’ll see where i may also be able to point you towards what you need to know or see.