Retail price was recorded at collection time and may differ at checkout.
Coupang delivers inside Korea only, so we link to the brand’s own page instead. The price above is the Korean retail price.
Sriver
Since its 1967 launch it has been the byword for high-elasticity, high-friction rubber, loved by players worldwide.
Performance
Butterfly official, 0-100About this product
Spin 23, speed 38, throw 23 — the lowest on every axis among the eight Butterfly rubbers here.
Reading those as simple weakness misses what Sriver is. It was the reference point of the era before tensor rubbers, and the low figures reflect how much the technology moved. Butterfly still publishes it on the same scale.
Practically, the meaning is clear: a speed of 38 means the ball barely travels, which actually helps while you are learning to swing fully. The ₩39,000 price matches that role.
Once you need power it is plainly insufficient. Feeling held back by this rubber is a sign your game has moved on.
What the numbers say
Inverted, 38° sponge. Its spin of 2.3 ranks 19 of 20 rubbers, among the lowest. It throws a lower, flatter ball. Based on the manufacturer’s published figures.
This paragraph is not a copied review — it is generated from the figures and rankings collected on this site, and changes when they do.
Full specifications
| Surface type | Inverted |
| Sponge hardness | 38 |
| Thickness options | 2.3 / 2.1mm |
| Colours | Red / Black |
| Made in | Japan |
Blades that pair with this rubber
Real player setups and level-based recommendations come first.
Innershield Layer ZLF
5-ply + 2 ZL-Fiber plies
A slower blade — easier-handling rubbers suit it
Hurricane Hao 2
5-ply (all-wood)
A slower blade — easier-handling rubbers suit it
Hurricane Long 5X
5-ply + 2 Arylate-Carbon plies (X construction)
A slower blade — easier-handling rubbers suit it
Hurricane Long 5A Outer (Ma Long)
5-ply + 2 A-fiber carbon plies (outer)
A slower blade — easier-handling rubbers suit it