Rock Tumbler Grit Kit 4-Step with Plastic Filler - Complete Tumbler

In this review of the Polly Plastics rock tumbler kit, the bottom line is simple: hobbyists and beginners who want a complete, ready-to-run polishing system will find everything they need in one package. The kit is aimed at users running a 15 lb. tumbler or multiple smaller barrels and stands out because it includes the full four-step grit progression plus plastic filler pellets, so customers do not need to source individual abrasives. The reviewer found the included instructions clear and the materials capable of producing a consistent, attractive polish when used as directed.

Key Features

• Complete 4-step set: Includes coarse, medium, fine and polish grits so users can run a full tumbling cycle without extra purchases.
• Measured-by-weight packaging: Steps 1 and 2 are 1 lb. each and Steps 3 and 4 are 12 lb. each, which matches typical material needs for each stage.
• Plastic filler pellets included: 1 lb. of high-impact polypropylene filler cushions fragile stones and reduces noise during runs.
• Compatible with all tumblers: The abrasives are suitable for use in any brand of tumbler and proved capable of producing a bright shine.
• Beginner friendly: Clear, printed instructions accompany the kit so first-time users can follow the four-step process reliably.

Who It's For

The kit is ideal for hobbyists, lapidary beginners, and classrooms that operate a single 15 lb. tumbler or up to five 3 lb. barrels, since it supplies the full complement of abrasives and a noise-reducing filler. It suits those who prefer a single packaged solution and value the convenience of measured jars and clear directions.

Professional shops doing high-volume runs or projects requiring unusual grit sizes may prefer to buy industrial quantities or alternate abrasives tailored to specific materials. Also, users needing very small sample quantities for testing may find the larger 12 lb. jars for steps 3 and 4 more than required.

Pros & Cons

Pros

• Contains all four necessary grit stages so users can complete a full polish without additional purchases.
• Plastic filler pellets protect fragile stones and cut down on tumbling noise during operation.
• Instructions are clear and printed on good-quality paper, making the kit approachable for beginners.
• Proven polishing materials that are compatible with all brand tumblers and produce a good shine.

Cons

• Packaging uses the same jar size for all steps, so heavier jars for steps 3 and 4 may appear less full despite containing the correct weight.

Specifications

Brand	Polly Plastics
Kit contents	1 lb 60/90, 1 lb 180/220, 12 lb 500, 12 lb 1200 polish, 1 lb plastic pellets
Grit types	Silicon carbide (60/90, 180/220, 500) and aluminum oxide 1200
Intended tumbler size	15 lb. tumbler or five 3 lb. tumbles
Country of manufacture	Made in the USA
Instructions	Included, beginner friendly

Our Verdict

The Polly Plastics 4-step grit kit with plastic filler is a convenient, good-value option for hobbyists and beginners who want a single package that covers the entire tumbling process. With measured weights for each step, clear instructions, and cushioning pellets to protect stones, it removes much of the guesswork from polishing and reliably produces a quality shine for most common lapidary materials.

Frequently Asked Questions

Can this kit be used in any brand of tumbler?
Yes, the abrasives and filler are compatible with all brand tumblers and are sized for standard 15 lb. or multiple 3 lb. barrels.

How many runs does the kit make?
The kit is sized to support full four-step cycles for a 15 lb. tumbler or up to five 3 lb. tumbles, with steps 1 and 2 sold as 1 lb. jars and steps 3 and 4 as 12 lb. jars.

Are the plastic filler pellets necessary?
The polypropylene pellets protect fragile stones from breakage and reduce tumbling noise, so they are recommended especially when working with smaller or brittle material.