Outer species: hinoki, koto, limba, walnut
If the core defines the base character of a blade, the outer plies define its first contact with reality. They are the ones that receive the impact transmitted through the rubber, the ones the player perceives most immediately and the ones that most influence the surface hardness of the blade. In a five-ply construction the outers are the two visible faces; in a seven-ply one they are still the visible faces, but with more intermediate plies beneath them that damp their effect; even so, they remain the first to respond.
What is asked of an outer wood is the opposite of what is asked of the core. Here density, hardness and surface stiffness are what matter. A soft outer ply would let the rubber sink too far on impact, absorbing energy that should be returned as speed. A hard outer ply, by contrast, offers a firm base against which the sponge of the rubber works efficiently. The usual combination — soft core, hard outers — is what produces the classic balance between absorption and response that defines the all-wood blade.
Hinoki (Chamaecyparis obtusa) is the most prized species for outer plies in the Japanese tradition, and probably the most singular on this list. Japanese cypress has a moderate density — between 400 and 500 kg/m³ — but its fine, uniform fibre structure gives it a rare combination: it is firm without being stiff, responds vividly to impact and transmits a clean, almost musical vibration that players describe as the most natural feeling in table tennis. Its characteristic aroma when the surface is sanded is not incidental: it indicates the presence of natural oils that make the wood resistant to humidity. Hinoki is also the basis of the single-piece blades for Japanese penhold, dealt with in 9.6. Its main drawback is cost: quality hinoki comes from slow-growing forests and the availability of uniform sheets is limited.
Koto (Pterygota macrocarpa) is the most widespread African alternative and the one appearing in the most commercial models. Its density — 550-650 kg/m³ — places it above hinoki, and its response is drier and more direct: less residual vibration, less nuance, more immediacy. Koto contributes surface speed without the need for composite, which makes it the standard choice for attacking all-wood blades of five and seven plies. It is not, however, the only route to a fast all-wood blade: the seven-ply Clipper and the five-ply Acoustic, two of the classics reviewed in 9.7, carry limba outers and owe their character to the construction and the core.
Limba (Terminalia superba) already appeared in 9.2 as an occasional core species, but its most frequent use is as an outer or intermediate ply. With a density of 500-550 kg/m³, it falls between hinoki and koto in hardness. Its character is warmer and somewhat more flexible than koto's, with a slightly longer surface dwell time. Limba is the reference outer wood in many allround and defensive models, where raw speed matters less than the capacity to hold the ball on controlled strokes.
Anegre (Aningeria robusta) is less well known but appears in models from several European brands. Its density is around 500-550 kg/m³ and its grain is fine and regular, which eases a very uniform surface finish. The response is neutral, without the edges of koto or the warmth of hinoki. It is used above all in the intermediate plies of seven-ply constructions and as an outer on mid-range blades where consistency between units is sought.
Walnut (Juglans regia) is the densest of the usual outer species, with values that can exceed 650 kg/m³. Its hardness produces a firm, very direct response, with little surface flexing. The result is a sense of solidity some players appreciate on flat strokes and blocks, but which can prove excessive for anyone who depends on fine touch. Walnut appears in seven-ply blades oriented towards power and in some Japanese designs seeking stiffness without composite.
The choice of outer species is not made in isolation. What matters is how it converses with the core: a koto outer over a kiri core produces a fast, direct blade; the same koto over ayous proves somewhat more damped. Those specific combinations take shape in the five-ply (9.4) and seven-ply (9.5) constructions that follow.