I love the Clover thimbles, I think they are silicone, they fit really good. You can get them in different colors, mine is yellow. The color denotes the size. They have the metal on the tip with a ridge around the outside to prevent the needle from slipping off. Before I found this, I always used the metal ones with the ridge, as the needle was always slipping off the thimble and hitting my finger where I didn't want it to go.