I use a stainless steel 'Thimblelady' thimble. They are relatively reasonable - about $25-35. The sizing instructions on their website are VERY accurate in my opinion. I started out with one of their plastic ones to see if I liked the configuration as well as to check for size (plastic ones @ $10 I think??). Sizing was perfect and I much prefer pushing with the pad of my finger vs the tip. Most times I use a hoop but sometimes not. I have also found service from their website to be quite good.