As a beginner to clay sculpting, I can't really comment on whether these are suitable for professional use, I'm a hobbyist and don't use them for professional sculpting. However, I can comment on the quality as I found it and I was very happy with these tools. The wooden handles are durable and comfortable to hold with no splinters or cracking and you get a great array of ends.

Do be careful with them as they are (for obvious reasons) sharp on the end, so definitely for adults and not suitable for very young children to use with clay. Older children will be ok with supervision, but definitely be aware certain ends are sharp to cut away the clay.

I'm having a lot of fun exploring this new hobby and like the different patterns, textures and cuts that these tools can give me. Being able to get a beginner's clay sculpting tool kit at this price point is awesome and I'm hoping that these tools will last me a good time before having to upgrade.

SUMMARY
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Pros
+ Seem to be good quality.
+ Durable and comfortable to hold handles.
+ No wood splitting or splinters.
+ Different ends on the tools, lots of different options.
+ Great price point for a beginner's kit.

Cons
- Ends can be sharp, so take care.

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Note: I received this product at a discounted rate in exchange for an unbiased, honest review as provided here. As a consumer advocate, I believe in providing quality and honest feedback and receiving a product at a discounted rate will never affect my opinions.