Which tension color is recommended for a 10 yr old ?

It depends what the child is attempting to accomplish. Is it intended for rehabof an injury? if so check with the doctor or physical therapist. OR Is it to strengthen for a particular sport? If so, than how far along is the strength in that hand of fingers. Typically the 3 lb is for the elderly with arthritis or rehab from an injury. While the 5 & 7 pound are the most popular for all ages. However, advanced athlete find the 7 & 9 pound too "easy" and then need to advance to the PRO (more than likely too large for a 10 year old hand)You may want to look at either the TWO packs with TWO tensions , or the FOUR pack withall four tensions 3,5,7,9. Fr a child stick with the regular Gripmaster NOT the PRO.

Which tension color would be recommened for a 14 year old guitar player?

It may depend on the size of the 14 year old, male or female, beginner or experienced guitarist. The RED (7 pounds) is the most popular and since the tensions range from 3 pounds to 9 in the regular GripMasterto 13 pounds in the PRO, the 7 is a mid range tension.If the child is in progressing with the instrument, you may want to consider a twin pack with two consecutive tensions.I hope this helps.

I lost the cushion grip for my heavy tension model. Is there a way to replace it?

No, you will need to replace the entire grip.

Is simply squeezing it enough or are there any specific exercises I should try out?

Like others, I am not aware of specific exercises. I do, however, turn it "upside down" , putting my fingertips to palm side of exerciser, and depress two of the plungers with my thumb - thus exercising that oft-neglected digit. 

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PROHANDS Gripmaster Hand Exerciser, Finger Exerciser (Hand Grip Strengthener), Spring-Loaded, Finger-Piston System, Isolate & Exercise Each Finger

Product ID: 48166082

Details

Brand
Prohands
Colour
Heavy - 9lb
Item weight
70 Grams
Material
Stainless
Style
Heavy (Black)

👜compact pocket-sized design

💪9 lbs resistance - heavy-duty strength

🖐️isolated finger piston system

₨13231

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Grip like a pro, anywhere you go! 💼

ERGONOMIC COMFORT - Palm cushion ensures fatigue-free sessions, so you can train longer and smarter.
PRO LEVEL STRENGTH BOOST - Build serious hand, wrist, and forearm power with 9 lbs of calibrated resistance.
ANYWHERE ANYTIME TRAINING - Sleek, pocket-sized design means you never miss a grip workout—commute, office, or home.
PRECISION FINGER ISOLATION - Patented spring-loaded pistons target each finger individually for unmatched dexterity gains.
TRUSTED BY PROS CREATIVES - Favored by athletes, musicians, and therapists for elite hand conditioning and recovery.

The PROHANDS Gripmaster Hand Exerciser is a compact, spring-loaded finger strengthener delivering 9 lbs of resistance per finger. Its patented piston system isolates each finger for targeted training, enhancing hand, wrist, and forearm strength, dexterity, and endurance. Ergonomically designed with a palm cushion, it fits in your pocket for convenient workouts anytime, favored by athletes, musicians, and therapists worldwide.

Specifications

ASIN	B0006GCBL4
Best Sellers Rank	123,402 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 141 in Hand Exercisers
Brand Name	Prohands
Colour	Heavy - 9lb
Customer Reviews	4.5 4.5 out of 5 stars (2,427)
Global Trade Identification Number	00768715216535
Item Dimensions L x W	9.2L x 7.3W centimetres
Item Shape	Variety
Item Weight	70 Grams
Manufacturer	Gripmaster Hand Exerciser
Material	Stainless Steel
Model Number	Heavy Tension
Number of Items	1
Number of Packs	1
Part Number	14003
Style	Heavy (Black)
Tension Supported	9 lbs
UPC	768715216535 011711985326 400110300739 758895140034
Unit Count	1.0 count

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