While polymer clays are sometimes associated with children’s craft projects or younger students, Kato Polyclay is a professional artist’s brand, created specifically for art projects. This clay is known for its strength and durability after it’s been cured as well as retaining color during the baking. It has a firmer feel than most other brands and receives good ratings for holding its shape extremely well. Kato Polyclay comes in 21 basic colors, several concentrates for mixing with other clays and translucent versions for mixing with other colors to add depth perception. The brand’s website offers a helpful chart detailing how to mix colors to create any possible shade an artist could want.