FAQ — Frequently Asked Questions

Are Kalmzo Sensory Stones safe for children?

Yes. All Kalmzo stones are CE marked and comply with EN71 EU toy safety standards. They are made from BPA-free, phthalate-free soft TPR rubber with smooth rounded edges. Suitable for ages 3 and above. Adult supervision is recommended for children under 3.

How do I clean the stones?

Simply wash with mild soap and warm water, then air dry. The rubber is non-porous and easy to keep hygienic — ideal for shared classroom use. Do not boil or put in a dishwasher.

Which pack size should I choose?

The 6 Pack is ideal for one child at home. The 12 Pack is our most popular — enough for home, school bag and a spare. The 24 Pack suits small therapy groups or classrooms. The 48 Pack Classroom Set gives every child in a typical class their own stone.

How long does delivery take?

Standard UK delivery is free and takes 2–3 working days. 

What if my child doesn't get on with them?

We offer a 30-day no-questions-asked return policy. If the stones aren't right, contact us and we'll arrange a full refund or swap. We want every child to find something that works.

Are these recommended by occupational therapists?

Yes. Textured sensory stones are a standard tool in occupational therapy for autism, ADHD, sensory processing disorder and anxiety. 

Can adults use these?

Absolutely. Many adults use Kalmzo stones as discreet desk fidgets for workplace anxiety, ADHD, or general stress. They are silent, professional-looking and pocket-sized.

Do you offer school or bulk discounts?

Yes — schools, therapy practices and bulk buyers can contact us at Support@Kalmzo.co.uk for a custom quote.