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Name: Medium Depth Probe v4.0
Brand: SquarePeg
Price: 129.00 USD
Availability: InStock

Goldilocks measures and compares adult toys. Everything here is written in plain words, and none of it is for under-18s.

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Slim Long Depth Probe v4.0 SquarePeg

girth4.2″ usable ≈33.1″ feelnot published

$189

Medium Depth Probe v4.0 SquarePeg

girth4.6″ usable ≈16.9″ feelnot published

$129

One on top of the other

Both outlines on one axis, at the same scale. Sizes come from the makers’ published girths; where a usable cut-out exists, the profile itself is traced from it. Where they overlap they’re the same; the gap is the difference.

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Slim Long Depth Probe v4.0≈33.1″ usable · widest shaft point 4.2″
Medium Depth Probe v4.0≈16.9″ usable · widest shaft point 4.6″

Side by side at the same scale

Drawn to scale: sizes from published girths, and the profile traced from the cut-out where we have one. Point positions along the shaft are approximate.

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How the numbers compare

Differences of about ¼ inch or more are highlighted. Blanks mean the maker doesn’t publish that point.

	Slim Long Depth Probe v4.0	Medium Depth Probe v4.0
Total length	40.2″	20.5″
Widest girth	4.2″	4.6″
Narrowest girth	3.5″	4.0″
Head girth	4.2″	4.6″
Base girth	3.5″	4.0″
Firmness options	not published	not published
Knot	no	no

Which one should you get?

Every line generated from the spec deltas above.

Stepping up from the Slim Long to the Medium adds 0.4″ of girth: 4.2″ around becomes 4.6″.
That’s a modest step: comfortably inside the half-inch-per-step increment people usually recommend.
The Slim Long is the longer of the two: about 16.9″ of usable length becomes 33.1″. Approximate — this maker publishes a total height rather than an insertable length.

See the Slim Long Depth Probe v4.0 → See the Medium Depth Probe v4.0 →

The other sizes of this sculpt

Same sculpt, the other steps in its size ladder — each one measured the same way.

Slim Short vs Slim Long Depth Probe v4.0