No, it's not but it feels like one.

Is it a 3C or 1-1.5C?

It is neither. It is very shallow.....that C designation on the Bach mouthpieces is a medium depth. There are charts that can give you an exact measurement. .....The rim size is smaller than the 1.5 or 3. I would say closer to the 10 1/2 C. ..... It is very easy to "overblow " and takes some work to play it in the register it was designed for. ...Articulation in lower registers is very difficult but seems to " slot " above the staff much easier...... I purchased a Kelly Screamer to experiment with. ..... joe

What is the size of the mouthpiece?

7C my son loves this mouthpiece

Is this mouthpiece good for high notes? How shallow is the cup?

I usually use mine for very cold weather we sound TAPS every Friday night no matter the weather. However I also used it for an outdoor Christmas concert and it did very well with the high notes I would say the cup is probably as deep as one that is on a 5c mouthpiece. I hope this helps you.

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Kelly Mouthpieces Screamer Lead Trumpet Mouthpiece Crystal Red

Product ID: 55114289

Details

Brand
Kelly
Color
Crystal-Red
Instrument Key
B Flat
Material
Lexan
Style
Modern

🎺0.6 inch rim inner diameter

🔥Shallow cup for bright lead tone

🧊Cold-resistant polycarbonate

Description

🎺 Play Bold, Play Bright, Play Unstoppable!

PRECISION LEAD SOUND - Thin throat and shallow cup deliver sharp, cutting lead trumpet tones.
PROUDLY MADE IN THE USA - Crafted entirely in Wisconsin for quality you can trust.
COMFORT MEETS DURABILITY - Softer, warmer feel than brass with virtually indestructible Lexan material.
WEATHERPROOF PERFORMANCE - Polycarbonate resin keeps your sound consistent, even in freezing temps.
SIGNATURE CRYSTAL RED STYLE - Stand out on the field or stage with vibrant, eye-catching color.

The Kelly Mouthpieces Screamer Lead Trumpet Mouthpiece in Crystal Red is a modern, durable alternative to traditional brass mouthpieces. Made from virtually indestructible polycarbonate resin, it resists temperature changes for reliable outdoor performance. Featuring a 0.6 inch rim inner diameter, thin throat, and shallow cup, it delivers a bright, focused lead trumpet sound with enhanced comfort. Finished in a striking crystal red, it’s perfect for musicians who want to combine style with professional-grade function, all proudly made in Wisconsin, USA.

Specifications

ASIN	B00K59OS4U
Best Sellers Rank	#89,603 in Musical Instruments ( See Top 100 in Musical Instruments ) #257 in Trumpet Mouthpieces
Brand Name	Kelly Mouthpieces
Color	Crystal-Red
Customer Reviews	4.4 4.4 out of 5 stars (29)
Finish Type	Polished
Included Components	Mouthpiece
Instrument Key	B Flat
Item Weight	0.02 kg
Manufacturer	KELLY Mouthpieces
Manufacturer Part Number	TPKSCR
Material Type	Lexan
Model Name	TPKSCR
Model Number	TPKSCR
Number of Items	1
Style	Modern
UPC	877302004827
Unit Count	1 Count

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