BIIB 9-in-1 Multitool Pen
- Aluminum pen body, ball tip
- Refillable pen format
- 2.08 ounces, small size
- 0.98 x 1.57 x 1.38 inches overall
- 6 lithium metal batteries listed as included
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A pocket-sized aluminum pen with a ball tip, meant for light marking and notes. The listing never shows a cutting blade, so do not buy it as a utility knife.
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ASIN: B0813NDWSDModel: BI-91Category: Utility & Work Knives
Overview
BIIB makes this small aluminum pen in yellow with a ball tip and a refillable body. The category label says knife, but the listed tool tip and included component both point to a writing instrument.
A compact metal body carries easily on a keychain or in a pocket and refills instead of being thrown away. The confusing part is the product type: no blade, blade length or locking details appear in the listing, so cutting jobs are not covered.
Who it's for
Anyone carrying a pen for quick notes or labels gets a small metal body with a refillable ball tip. Tradespeople who need to slice cardboard, trim cord or score material should buy a real utility knife.
Pros and cons
- Aluminum body resists everyday knocks
- Refillable instead of disposable
- Very light in a pocket
- Ball tip suits ordinary writing
- Blade not listed, so no cutting use
- Small size is hard to grip firmly
- Ink colour not listed
- Battery claims contradict each other
Performance notes
Writing quality depends on the ball tip and the refill fitted, and the short barrel gives less leverage than a full-size pen. Aluminum holds the weight down but marks easily against keys and coins. The battery lines in the listing do not match a plain mechanical pen, so any powered feature is unconfirmed.
Specifications
| Brand | BIIB |
|---|---|
| Model | BI-91 |
| Dimensions & fit | |
| Size | Small |
| Item dimensions | 0.98 x 1.57 x 1.38 inches |
| Item weight | 2.08 ounces |
| Power & efficiency | |
| Battery Cell Type | Alkaline |
| Construction & materials | |
| Color | Yellow |
| Material | Aluminum |
| Included components | |
| Number Of Pieces | 1 |
| Included Components | Pen |
| Batteries Included | Yes |
| Other details | |
| Batteries Required | No |
| Special Features | Refillable |
| Batteries | 6 Lithium Metal batteries listed, included |
| Tool Tip Description | Ball tip |
Closest rivals on specs
Frequently asked questions
How do I care for the BIIB BI-91 pen?
Wipe the aluminum body with a dry cloth and keep it away from keys that can scratch it. The listing says it is refillable, so replace the refill rather than the pen.
Is the BIIB BI-91 a knife with a blade?
No blade, blade length or locking mechanism is listed. The tool tip is a ball tip and the included component is a pen, so treat it as a writing instrument.
Does the BIIB BI-91 need batteries?
The listing is inconsistent. It names 6 lithium metal batteries as included but also says batteries are not required, so confirm before relying on any powered feature.