Titration Hard Enamel Pin, Science, Chemistry, Biology, Forensic, Lab, Doctor Fun and quirky pins designed by an escape room enthusiast, puzzle lover and true crime fanatic Pin details: Type: Hard Enamel Backing: 1 Rubber clutch Material: Nickel Sizes: 35 mm Please allow for minor variations in colour due to picture and monitor resolution - Items are not sent via tracked post. However, the shipping method can be upgraded to registered post (includes tracking number) at the checkout.