Introducing

Summer
bass rosin

Stronger catch. Clean release. No bow powder. No drying out. No hot mess.

Get Summer

Testimonials

Unsolicited and uncompensated testimonials for Winter. Testimonials for Summer coming soon!

This stuff works!

Timothy Cobb Principal Bass, New York Philharmonic

For the first time, I feel like I get that spring/fall rosin punch during the coldest time of the year.

Glenn Gordon Assistant Principal Bass, Oslo Philharmonic

Handled Swiss winter with no problem, including an outdoor Christmas gig in the snow!

Orr Paradise International Jazz Bassist

It's the first rosin I've used that doesn't have issues with consistency, so I don't have to overthink when to put it on.

Paul Nemeth Associate Principal Bass, The Florida Orchestra

I am able to get the most delicate and raucous of articulations and sound with everything in between.

Abe Gumroyan Grammy Award-Winning Bassist, Los Angeles

"Rosin that doesn't go bad is a terrible business idea."
— Everyone

Bass rosins usually make you choose: fading powder, or noisy grip.

Summer gives you stronger starting catch and clean release.

Winter gives you gentler starts with responsive grab when you dig in.

Both stay good year after year.

Optimal Room Temp 70-90°F / 21-32°C

Summer

$48

Free shipping

Catch Stronger initial catch than Winter.

Release Clean through the stroke. No gritty, gummy feel.

Won't dry out or powder your bow Good 5+ years.

Optimal Room Temp 60-75°F / 16-24°C

Winter

$48

Free shipping

Dynamic Gentle start on soft notes with punchy grab under pressure.

Versatile Works alone or as a base-layer boost.

Won't dry out or powder your bow Good 5+ years.

1-year money-back guarantee

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Checkout

If your country isn't listed, email bassmentrosin@gmail.com to order directly.

The Story

Bassment Rosin

I'm Isaac Trapkus, a bassist in the New York Philharmonic.

Bassment Rosin grew out of my frustration with rosin and lifelong habit of starting overly complicated projects.

Summer — stronger catch, clean release.

Winter — stable grab in cold, dry rooms.

2019

I started researching how rosin works and naively assumed it would be easy to make a great one. I wanted a bass rosin that would feel consistent, last the whole concert, and never go bad.

100+
attempts

There is almost nothing written about making bass rosin, so it became a long process of trial and error while researching resin use in other industries. The hard part was balancing grip, release, and temperature tolerance without sacrificing long-term stability.

Summer
& Winter

Winter launched after five years of development, solving the cold/dry problem with stable, responsive grab. It took another 18 months to figure out a Summer solution: solid catch and clean release, even at higher temperatures.

Questions

Everything you need to know about Summer and Winter.

Summerbass rosin