Circulon Ultimum 23cm Round Sandwich Cake Tin 4 "Robust product" Mrs Evans 27 June 2018 These are the second circulon products that I have bought. They are really heavy duty and have excellent conductivity. Consequently, they give a really good bake. I think they are worth the extra cost if you are buying new tins. A note from the team Thank you for placing your review. I'm delighted these Circulon cake tins work so well for you!