Introducing

Summer
bass rosin

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

Get Summer

Testimonials

Shared voluntarily and without any compensation.

This stuff works!

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 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 Assistant Principal Bass, Oslo Philharmonic

Winter is 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. Summer's tone is pure and smooth, but still has strong grip on the front end.

Paul Nemeth Associate Principal Bass, The Florida Orchestra

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

Orr Paradise International Jazz Bassist

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.

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.

Ship to

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

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

Summerbass rosin