Mr. Kikuchi’s Size Guide: Where Should I Start?
If this is your first Kikuchi Toy, you do not need to understand every shape, material, or size before choosing.
Start with something much simpler:
What size are you already comfortable with?
The best first Kikuchi is usually not the biggest one you want to reach someday. It is the one that gives you a realistic next step from where you are now.
First, Know Your Current Size
If you already own a toy that feels comfortable, check its maximum diameter — the width at its widest point.
That number gives you the easiest starting reference.
| Your current experience | A good place to start |
|---|---|
| New to larger toys or unsure | XS — usually below 4.5 cm |
| Comfortable with regular realistic-size toys | S — around 4.5–5.5 cm |
| Comfortable with noticeably thicker toys | M — around 5.5–6.5 cm |
| Experienced with large toys | L — around 6.5–7.5 cm |
| Very experienced with large toys or fisting | XL+ — usually above 7.5 cm |
These ranges are a guide, not a rule.
If you are choosing between two sizes and are not sure, I recommend starting with the smaller one.
You can always move up later.
New to Toys? Start Simple
If you have little or no experience with larger toys, do not worry about finding your “perfect” final size.
Start with a size that looks approachable.
For most pure beginners, XS is the safest place to begin exploring Kikuchi’s larger shapes. If you already use regular adult toys comfortably, S may be the more natural starting point.
Your first purchase should help you understand how your body responds to shape and pressure — not test how much you can take.
What Does “Maximum Diameter” Mean?
On each Kikuchi product page, you will see measurements such as diameter and insertable length.
Maximum diameter simply means the widest part of the toy.
But it does not tell the whole story.
Imagine two toys that are both 6 cm wide:
One slowly tapers from narrow to wide.
The other reaches 6 cm almost immediately.
They may have the same maximum diameter, but they will not feel the same.
That is why you should always look at the shape, not just the number.
Shape Can Matter More Than Size
When looking at a Kikuchi Toy, ask:
How does it reach its widest point?
A gradual taper gives you more distance to progress through the size.
A large rounded section creates pressure more quickly.
A narrower neck after a wider section changes what happens after the widest point passes.
A longer toy introduces depth as another part of the experience.
So instead of asking only:
“How big is it?”
also ask:
“Where is it big, and how do I get there?”
This is one of the biggest differences between Kikuchi designs.
What About Soft, Medium, and Firm?
Firmness changes how a size feels.
You do not need to understand every construction before buying. The firmness offered for a product is the configuration we recommend for that design.
If you are unsure, start there.
Learn more about Kikuchi firmness here.
Do Not Compare Kikuchi Sizes by Letter Alone
An S Panther and an S from another product family are not necessarily the same experience.
The letters XS / S / M / L / XL help organize the range, but every shape has its own dimensions and purpose.
Always check the actual measurements on the product page before ordering.
The letter tells you roughly where a product sits in the range.
The measurements and shape tell you what you are actually buying.
How I Would Choose My First Kikuchi
My process would be simple:
1. Find the widest toy you already use comfortably.
2. Check its maximum diameter.
3. Choose a Kikuchi product around that size, or slightly above it if you want progression.
4. Look at the shape.
A gradual taper will behave differently from a sudden bulge, even at the same diameter.
5. If you are between sizes, choose the smaller one.
You do not need to plan five sizes ahead.
Choose the one that makes sense now.
When Should You Move Up?
Using a larger size once does not automatically mean you need the next size.
I would move up when your current size feels familiar and controlled rather than difficult.
You understand the shape.
You know how your body responds to it.
You are no longer fighting the size.
That is a much better foundation for progression.
One Last Rule
Do not buy the size you want to prove you can use. Buy the size you are likely to enjoy using.
Kikuchi has larger sizes waiting when you are ready for them.
There is no need to skip the part in between.
Use sufficient compatible lubricant, go slowly, and never force a toy through sharp pain or strong resistance.
Still Not Sure?
Size is only one part of the decision. Our anal stretching toy guide also explains how taper, working width, depth and firmness change the experience.
We are also here helping you find a realistic starting size.
support@kikuchitoys.com
X: @KikuchiToys
Mr. Kikuchi
Founder of Kikuchi®