i decided to make the claim more positive and want to see if it's valid:

Example: I bought this art kit and i'm pretty happy with it!< claim) The paint brushes are smooth and the bristles don't become frizzy and uneasy to use.<reason 1)

I love that there's a variety of paint, markers, colored pencils. It is easy to make smooth gradients with the markers and pencils. < reason 2)

I like reason 2

For reason 1, you'd better check on the meaning of "uneasy"

The paint brushes are smooth and the bristles don't become frizzy and u̶n̶e̶a̶s̶y̶ hard to use.

Thanks! I was a little unsure about "uneasy" so is this better?: "make it easy to use. or: "makes it better to use then other types of paint brushes"

To determine if the claim is valid, we need to evaluate the reasons provided. Let's break it down:

Reason 1: "The paint brushes are smooth and the bristles don't become frizzy and uneasy to use."
To verify this claim, you can examine the paint brushes and use them to see if the bristles remain smooth and do not become frizzy. Pay attention to how easy they are to use and if they make your painting experience comfortable. Additionally, you can also check reviews and feedback from other customers who have used the same art kit to see if they mention the same positive characteristics about the paint brushes.

Reason 2: "I love that there's a variety of paint, markers, colored pencils. It is easy to make smooth gradients with the markers and pencils."
To assess this claim, you can check the art kit to confirm if it indeed offers a variety of paint, markers, and colored pencils. Additionally, use the markers and colored pencils to create gradients and assess if they allow for smooth blending. Again, consulting customer reviews or seeking expert opinions on the art kit can provide further insight into the claim's validity.

Ultimately, your personal experience with the art kit and the observations made during use, along with additional research like reviews, will help determine the validity of the claim.