The leather holder possibly is suitable for some catapulting but if one hopes to use ball bearings less than an 2.5cm in diameter, try and find something else. This catapult's is far too thick and it'd need very nimble fingers to insert and keep a ball bearing in ti before firing. Also, do note the packing and postage charge. The catapult weighs about 150gms and comes in an armour plated plastic packing needing a sharp knife to extract. So, it hardly needs nearly £5 being spent on postage. Of course, this may be partly in line with Amazon having minimum orders of £10 and this retailer hopes that we nits out here will up requirements.