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Summer and Winter BASSMENT Rosin arranged side by side

Professional Grade Double Bass Rosin

Push the limits.
Stay in control.

Summer / 70-90F Rooms Handmade by Isaac Trapkus Winter / 60-75F Rooms

Testimonials

Shared voluntarily and without any compensation.

This stuff works!
Timothy Cobb
Timothy Cobb Principal Bass, New York Philharmonic
As a lifelong Pops user, Summer feels very familiar. Great bite and grip in the string - super clean and articulate.
Timothy Dilenschneider
Timothy Dilenschneider Associate Principal Bass, Houston Symphony
For the first time, I feel like I get that spring/fall rosin punch during the coldest time of the year.
Glenn Gordon
Glenn Gordon Assistant Principal Bass, Oslo Philharmonic
Winter is the first rosin I've used that doesn't have issues with consistency... Summer's tone is pure and smooth, but still has strong grip on the front end.
Paul Nemeth
Paul Nemeth Associate Principal Bass, The Florida Orchestra
Handled Swiss winter with no problem, including an outdoor Christmas gig in the snow!
Orr Paradise
Orr Paradise International Jazz Bassist
Summer bass rosin product photo
Optimal Room Temp 70-90°F / 21-32°C

Summer

$52

Free shipping

1-year money-back guarantee
Catch Stronger initial catch than Winter.
Release Clean through the stroke. No gritty, gummy feel.
Good 5+ years Won't dry out or powder your bow.

Winter double bass rosin product photo
Optimal Room Temp 60-75°F / 16-24°C

Winter

$52

Free shipping

1-year money-back guarantee
Dynamic Gentle start on soft notes with punchy grab under pressure.
Versatile Works alone or as a base-layer boost.
Good 5+ years Won't dry out or powder your bow.

Checkout

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

1-year money-back guarantee
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.

See how they play

Summer Stronger catch · clean release
Winter Stable grab · cold, dry rooms
Development
100+ Attempts

I started with a simple goal: make a bass rosin that felt consistent, lasted through the concert, and didn’t go bad. The hard part was balancing grip, release, temperature range, and long-term stability.

Two different
problems.

Winter and Summer are not simply softer and harder versions of the same idea. Each was built around a different failure point.

Cold / Dry

Winter

Easy and responsive, with another gear when the music demands it.

Winter was designed to work two ways: on its own, or as a cold-weather base layer under rosins like Pops when dry air and lower temperatures reduce their response. It needed to stay easy and responsive for loose, gestural playing, with another gear when the music demands it—without becoming gritty, gummy, or noisy.

Warm / Hot

Summer

Immediate catch that stays controlled when the temperature rises.

Summer was a different problem. In heat, soft rosins can become overly sticky or messy, so Summer had to deliver that familiar immediate catch on its own — while staying controlled at higher temperatures and still feeling right at normal room temperature.

Questions

Still have questions? Text me directly: +1 848-209-1242 (Isaac)