Sculpey Premo 57 gram
This is a good all-around clay that is good for beginners and for those with chronic pain.
It is quite soft but not too soft and still keeps its shape while you are working and in the oven.
Very thin details should be supported while your project is in the oven.
Premo is after correct baking a durable clay.
Always use an oven thermometer to make sure you reach the correct temperature because if you don´t reach the correct temperature the clay will be hard and fragile.
Premo bakes at 130 degrees Celcius.

Premo also has a long shelf life before it becomes hard and crumbly. Hard and crumbly is not ruined but a little bit harder to condition and maybe you need to add a bit of liquid clay or softener.