Butterfly

Sriver

Name: Butterfly Sriver
Brand: Butterfly
SKU: sriver

InvertedALL+ClassicITTF

Butterfly’s classic Japanese inverted — non-tensor, linear, the long-running reference sheet that still outsells fashion tensors in some clubs.

8.7 community score · 2,100 reviews · €28

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About Sriver

Sriver is not Tenergy. Combined speed 78, spin 80, control 90, hardness 38°. It is the grippy, classic sponge inverted Butterfly sold for decades before Spring Sponge.

Sriver EL is the softer sibling. Rozena / Roundell are the High Tension steps below Tenergy if you want catapult without the tour invoice.

Buy Sriver if you want linear Japanese rubber for allround and blocking, or a coaching default that does not launch. Do not buy it expecting Tenergy throw.

Playing specs

Blend of official and community. Community weight 60% with 2,100 reviews (20–60% as sample size grows).

Speed78

Spin80

Control90

Tick mark on each bar is the official value.

Factory specifications

Hardness: 38°
Weight: 44 g
Year: 1970
Made in: Japan
Series: Sriver

Factory thicknesses

Factory sponge thicknesses sold in Europe: 1.8, 1.9, 2.0, 2.1, MAX. These are shopping facts — Combined speed / spin / control on this page do not change with thickness.

1.8: Thinner inverted sponge. Allround and first-upgrade backhands live here more often than attacking forehands.
1.9: The usual club backhand thickness on inverted tensors. A bit more control, a bit less catapult than 2.1 / MAX.
2.0: Mid-thick. Common on the backhand when MAX felt lively, or as a two-wing compromise.
2.1: Still a thick attacking sponge. A small step down from MAX on some tensors — shops treat it as the other FH thickness, not a control sheet.
MAX: Thickest factory sponge. Most catapult on a tensor; the usual attacking forehand. Combined figures on this page are for the SKU, not a separate MAX score.