Very handy set to have, I bought these to renew around my bathroom in time for guests over the new year. There's a good variety of sizes in the pack which is good for me, I wouldn't have a clue what size I would need to buy.
I've only used it with silicone on my sink so far but it makes the job a lot neater, I still went along with my finger first but then finished off with the tool. They are made from a flexible plastic so shouldn't snap. It comes with two plastic scraper tools aswell.
Would use again, probably try around my windows soon, my cat keeps clawing my old one off for some reason.