Armstrong WKT Mk II 12.5L 4'0

12.5volume, L
1,220length, mm
435width, mm
2.80slenderness

Build hard Disciplines wake, kite, tow

The WKT Mk II has 2 sizes in the current range, from 10 to 12 L. Its slenderness, 2.80, is greater than that of 41% of the 1,895 current boards that publish a length and a width.

Closest boards from other brands

Mount is shown beside each board, never matched on.

Current boards from other brands within ±7% of volume and ±2% of length, and ±2% of slenderness where both publish a width of the Armstrong WKT Mk II 12.5L 4'0, closest first.
Brand	Board	Volume L	Δ volume	Length mm	Δ length	Slenderness	Mount
PPC Foiling	UFO Pro 4'0" 13L	13	+4.0%	1,210	-0.8%	—	—

Specifications

Every figure is Armstrong's own, read from the source linked in the last row, converted to millimetres and kilograms where the brand prints inches or pounds. Slenderness is computed here, length ÷ width.
Family	WKT
Model	WKT Mk II
Size, as the brand prints it	12.5L 4'0
Volume, L	12.5
Length, mm	1,220 (4'0")
Width, mm	435
Thickness, mm	32
Weight, kg	2.9
Slenderness (length ÷ width)	2.80
Slenderness band	2.5–3.0
Mount	—
Strap inserts	yes
Build	hard
Construction	moulded carbon, quad carbon stringer system
Disciplines	wake, kite, tow
Rider weight	—
Rider level	—
Model year	—
Source	manufacturer · read 2026-10-02

Every figure above is the manufacturer's published claim, converted to comparable units.

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