How to Understand Cake Fireworks Specifications: Tube Size (Inches) vs Powder Weight (Grams)

2026-01-05

Cake fireworks are categorized using two different specification systems, depending on the country and application:

1. Tube Size (Inches): The International Standard Specification

Most international buyers—including Europe, South America, Asia, and professional U.S. buyers—use tube diameter (inches) to measure cake fireworks.

Common Tube Sizes

Tube Size	Metric (mm)	Application
0.75 inch	18–20 mm	Small cakes, rapid-fire cakes
1.0 inch	25 mm	Standard consumer cakes, most 16–25 shots
1.2 inch	30 mm	Higher performance, louder bursts
1.5 inch	38 mm	Professional-style cakes, large effects
1.75 inch	45 mm	Premium cakes, strongest consumer effects

Why Tube Size Is Important

Determines effect size & burst diameter
Indicates tube strength & powder capacity
Helps buyers compare products across suppliers
Matches customers’ performance expectations

How Tube Size Is Written

1.0" 16 Shot Peony Cake
1.2" 25 Shot Brocade Crown Cake
1.5" Fan Shape 49 Shot Cake
1.75" Premium Finale Cake

This is the most accurate and professional way to specify cake fireworks.

2. Powder Weight (Grams): The U.S. Regulatory Classification

In the United States, retail fireworks follow CPSC regulations, so cake fireworks are grouped by total powder weight.

Common US Categories

Category	Limit	Usage
200g Cakes	≤ 200 grams total powder	Small, fast retail cakes
350g Cakes	200–350 grams	Mid-level performance
500g Cakes (Maximum Load)	≤ 500 grams	Largest legal consumer cakes

Why the U.S. Uses Gram Weight

Powder weight is regulated by law
Retail stores organize shelves by gram class
Helps determine consumer safety level
Influences shipping and packaging rules

How Powder Weight Is Written

200g 25 Shot Color Cake
350g Z-Shape Silver Tail Cake
500g Maximum Load Multi-Effect Cake

Gram classification is mainly for compliance and retail marketing in the U.S.

3. How Both Systems Relate to Each Other

Although they describe the same product, they focus on different aspects:

Tube Size (Inches)	Powder Weight (Grams)	Notes
Describes performance & effect size	Describes legal class & safety limits	Both are useful
Used internationally	Used mainly in the U.S.
Focus on tube diameter	Focus on total powder
Important for product description	Important for regulatory labeling

Example Comparison

A cake described as:

1.2" 25 Shot Fan Shape Cake
Usually belongs to:
350g or 500g class, depending on powder load.

A cake described as:

500g Maximum Load Cake
Usually uses 1.2"–1.5" tubes.

4. How Buyers Should Use These Specifications

For International Buyers

Use tube size (inch) + shot count
→ Helps understand performance level

For U.S. Buyers

Use gram class + effects
→ Must comply with CPSC and DOT rules

For Website Product Pages

Best practice is to show both:

✔ Tube Size + Shot Count

(Professional, international readability)

✔ Gram Class

(Compliance & marketing value)

5. Recommended Product Description Format (Best Practice)

Perfect for Website Listings, Catalogs, and Packaging

Example 1:

1.2" 25 Shot Fan Shape Brocade Crown Cake (500g Maximum Load)

Example 2:

1.0" 16 Shot Color Peony Cake (200g Class)

Example 3:

1.5" 49 Shot Z-Shape Silver Tail Cake (500g Category)

Example 4:

0.8" 100 Shot Rapid Fire Cake (200g Class)

Conclusion

Both specification systems are correct—just used for different purposes.

Tube Size (Inches)

→ Best for international buyers, performance evaluation, and professional product descriptions.

Powder Weight (Grams)

→ Required for U.S. regulatory classification (200g / 350g / 500g).

The most professional approach is to include BOTH in product introductions, allowing global customers to understand performance and compliance simultaneously.