Q1: Don't know how to choose the Hoop Length?
A1: Hoop Length refers to the length from the left bracket to the right bracekt of the regular frame (plastic frame) that comes with your machine. Just measure the regular frame of the machine to get the Hoop Length data ( Photos as reference for you)
Q2: Not sure if this size can be used for your machine?
A2: Measure the Hoop Length of your different plastic frames to see if it is the same as the hoop length in the options. If yes, the frame can use on your machine.
Magnetic Hoop 6.5"x6.5" | 165x165mm for Rainbow Embroidery Machines

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Description
6.5″x6.5″(165x165mm) refers to the inner hoop dimension. The actual sewing field is about 5.7″x5.7″(145x145mm).
Product Features
Super durable and strong: 500,000 times repeated using and strict destructive testing.
Idea for all kinds of fabric hooping: Hard-to-clamp items, like heavy, thin, fragile, stretchy, and elastic fabrics.
17+hoop sizes: 3.9x3.9 inch/100x100mm ~ 17x15.5 inch /430x390mm meet all your needs.
Tough Durability Testing Video
Product Application
It is perfectly embroidering on:
1. Great for medium-sized patterns on the front and back of T-shirts, sweatshirts, hoodies, polo shirts, jackets, jeans.
2. Ideal for children’s wear, baby clothes.
3. Medium patterns on larger accessories like backpacks and shoulder bags, pillow.
Customer Using Reference
Packing List
1. Hoop Main Part x 1 pcs
2. Metal Brackets x 1 pair
3. Screws & Screwdriver
(Note: Brackets will be matched according to your machine brand, and need to be assembled on hoop main part with screws)
Compatible with Rainbow Embroidery Machine Models.
Rainbow single head machine models:
- RBE2235-A12 1201 / RBE2235-A12 901/ RBE4060-A12 1201 / RBE4060-A12 1501
Rainbow multi-heads machine models:
- 2 Heads :RBE4050-B12 902 / RBE4050-B12 1202 / RBE4050-B12 1502
- 4 Heads :RBE4040-D12 904 / RBE4040-D12 1204 / RBE4040-D12 1504
- 6 Heads :RBE4045-F12 906 / RBE4045-F12 1206 / RBE4045-F12 1506
- 8 Heads :RBE4050-H12 908 / RBE4050-H12 1208 / RBE4050-H12 1508