Butterfly InnerForce Layer series was launched in April 2015 as the renewal of former InnerForce series. By the renewal, the size of head was unified to 157mm x 150mm, and the design theme of InnerForce ZLC was applied to all models. The InnerForce series before the renewal was overshadowed by the popularity of the Timo Boll series whose major models are outer-fiber blades. However, as interest in inner fiber composition gradually increased after the introduction of Poly ball, the InnerForce Layer series became very popular, and eventually settled down as one of Butterfly’s representative blade series. InnerFoce Layer series consists of five models with different fiber materials. But, the most important models among five are InnerForce Layer ZLC and InnerForce Layer ALC, and those two are now being used by many top players. In addition, several derivative products based on them are also being released. InnerForce Layer ZLC is recommended first for players who have used classic 7-ply plywood in the past, and InnerForce Layer ALC is the first recommendation for players who have used 5-ply plywood in the past and want to change to a fiber blade in the Poly Ball era.

Left is InnerForce Layer ALC, and right is InnerForce Layer ALC. The design of InnerForce Layer ALC isn’t much different from the design of InnerForce ZLC before renewal. And, that design concept is being applied to all models of InnerForce Layer series now.
The constructions of two models are identical to each other except for the fiber. Upper is InnerForce Layer ZLC and lower is InnerForce Layer ALC.
Identical design theme is being applied to both of two models. Interestingly, the name of series printed on the blade head isn’t ‘InnerForce Layer’ but ‘InnerFiber Layer’. We don’t know if this is a simple mistake or intentional.
Instead of a lens indicating the kind of fiber, a small holographic lens is applied to the back of the handle. This is one of the characteristics of current Butterfly blades.
InnerForce Layer ZLC. Overall apprearnace is very similar to that of old InnerForce ZLC. But, the head size has been reduced from 158mm x 152mm to 157mm x 150mm.
ZLC (= PBO Carbon) is inserted between the middle layer and the center layer of 5-ply wood construction. Top layer is Limba. Middle and center layers are Ayous. Overall thickness is around 5.7mm.
There isn’t any printing on the backside of blade head.
InnerForce Layer ALC. Graphic design has been greatly changed from old InnerForce ALC. But, everything other than graphic design is identical to that of old InnerForce ALC.
ALC (= Arylate Carebon) is inserted between the middle layer and the center layer of 5-ply wood construction. Top layer is Limba. Middle and center layers are Ayous. Overall thickness is around 5.8~5.9mm. (But, on the home page of Butterfly, it is written as 6.0mm.)
There isn’t any printing on the backside of blade head.

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